Commit | Line | Data |
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826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
0fdd1e2c | 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d | 4 | * |
54d01ffb DG |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; only version 2 of the License. | |
91d76f53 | 8 | * |
54d01ffb DG |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
91d76f53 | 13 | * |
54d01ffb DG |
14 | * You should have received a copy of the GNU General Public License along with |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <fcntl.h> | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
8c0faa1d | 25 | #include <semaphore.h> |
fac6795d DG |
26 | #include <signal.h> |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
0fdd1e2c | 30 | #include <sys/mman.h> |
b73401da | 31 | #include <sys/mount.h> |
1e307fab | 32 | #include <sys/resource.h> |
fac6795d DG |
33 | #include <sys/socket.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
0fdd1e2c DG |
36 | #include <sys/wait.h> |
37 | #include <urcu/futex.h> | |
fac6795d | 38 | #include <unistd.h> |
3bd1e081 | 39 | #include <config.h> |
fac6795d | 40 | |
3bd1e081 | 41 | #include <lttng-consumerd.h> |
e88129fc | 42 | #include <lttng-sessiond-comm.h> |
3bd1e081 | 43 | #include <lttng/lttng-consumer.h> |
2bdd86d4 | 44 | |
1e307fab | 45 | #include <lttngerr.h> |
fac6795d | 46 | |
54d01ffb | 47 | #include "channel.h" |
5eb91c98 | 48 | #include "compat/poll.h" |
099e26bd | 49 | #include "context.h" |
54d01ffb | 50 | #include "event.h" |
099e26bd | 51 | #include "futex.h" |
f6a9efaa | 52 | #include "hashtable.h" |
4771f025 | 53 | #include "kernel.h" |
32258573 | 54 | #include "lttng-sessiond.h" |
0fdd1e2c | 55 | #include "shm.h" |
56fff090 | 56 | #include "ust-app.h" |
1e307fab | 57 | #include "ust-ctl.h" |
8e68d1c8 | 58 | #include "utils.h" |
fac6795d | 59 | |
ebaeda94 MD |
60 | #define CONSUMERD_FILE "lttng-consumerd" |
61 | ||
3bd1e081 MD |
62 | struct consumer_data { |
63 | enum lttng_consumer_type type; | |
64 | ||
65 | pthread_t thread; /* Worker thread interacting with the consumer */ | |
66 | sem_t sem; | |
67 | ||
68 | /* Mutex to control consumerd pid assignation */ | |
69 | pthread_mutex_t pid_mutex; | |
70 | pid_t pid; | |
71 | ||
72 | int err_sock; | |
73 | int cmd_sock; | |
74 | ||
75 | /* consumer error and command Unix socket path */ | |
76 | char err_unix_sock_path[PATH_MAX]; | |
77 | char cmd_unix_sock_path[PATH_MAX]; | |
78 | }; | |
79 | ||
75462a81 | 80 | /* Const values */ |
686204ab | 81 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 82 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
83 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
84 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
85 | ||
fac6795d | 86 | /* Variables */ |
1d4b027a | 87 | int opt_verbose; /* Not static for lttngerr.h */ |
3bd1e081 | 88 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
1d4b027a | 89 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 90 | |
fac6795d DG |
91 | const char *progname; |
92 | const char *opt_tracing_group; | |
5b8719f5 | 93 | static int opt_sig_parent; |
fac6795d | 94 | static int opt_daemon; |
4fba7219 | 95 | static int opt_no_kernel; |
fac6795d | 96 | static int is_root; /* Set to 1 if the daemon is running as root */ |
1d4b027a | 97 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
67e40797 | 98 | static char *rundir; |
3bd1e081 MD |
99 | |
100 | /* Consumer daemon specific control data */ | |
101 | static struct consumer_data kconsumer_data = { | |
102 | .type = LTTNG_CONSUMER_KERNEL, | |
7753dea8 MD |
103 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
104 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, | |
3bd1e081 | 105 | }; |
7753dea8 MD |
106 | static struct consumer_data ustconsumer64_data = { |
107 | .type = LTTNG_CONSUMER64_UST, | |
108 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, | |
109 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, | |
110 | }; | |
111 | static struct consumer_data ustconsumer32_data = { | |
112 | .type = LTTNG_CONSUMER32_UST, | |
113 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, | |
114 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, | |
3bd1e081 MD |
115 | }; |
116 | ||
099e26bd | 117 | static int dispatch_thread_exit; |
fac6795d | 118 | |
54d01ffb DG |
119 | /* Global application Unix socket path */ |
120 | static char apps_unix_sock_path[PATH_MAX]; | |
121 | /* Global client Unix socket path */ | |
122 | static char client_unix_sock_path[PATH_MAX]; | |
54d01ffb DG |
123 | /* global wait shm path for UST */ |
124 | static char wait_shm_path[PATH_MAX]; | |
fac6795d | 125 | |
1d4b027a | 126 | /* Sockets and FDs */ |
d6f42150 DG |
127 | static int client_sock; |
128 | static int apps_sock; | |
20fe2104 | 129 | static int kernel_tracer_fd; |
7a485870 | 130 | static int kernel_poll_pipe[2]; |
1d4b027a | 131 | |
273ea72c DG |
132 | /* |
133 | * Quit pipe for all threads. This permits a single cancellation point | |
134 | * for all threads when receiving an event on the pipe. | |
135 | */ | |
136 | static int thread_quit_pipe[2]; | |
137 | ||
099e26bd DG |
138 | /* |
139 | * This pipe is used to inform the thread managing application communication | |
140 | * that a command is queued and ready to be processed. | |
141 | */ | |
142 | static int apps_cmd_pipe[2]; | |
143 | ||
1d4b027a | 144 | /* Pthread, Mutexes and Semaphores */ |
1d4b027a | 145 | static pthread_t apps_thread; |
099e26bd | 146 | static pthread_t reg_apps_thread; |
1d4b027a | 147 | static pthread_t client_thread; |
7a485870 | 148 | static pthread_t kernel_thread; |
099e26bd | 149 | static pthread_t dispatch_thread; |
5eb91c98 | 150 | |
fac6795d | 151 | |
099e26bd DG |
152 | /* |
153 | * UST registration command queue. This queue is tied with a futex and uses a N | |
154 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
155 | * | |
156 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
157 | * this queue and the wait/wake scheme. | |
158 | */ | |
159 | static struct ust_cmd_queue ust_cmd_queue; | |
160 | ||
b5541356 DG |
161 | /* |
162 | * Pointer initialized before thread creation. | |
163 | * | |
164 | * This points to the tracing session list containing the session count and a | |
165 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
166 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 167 | * |
d063d709 | 168 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
54d01ffb | 169 | * session_lock_list and session_unlock_list for lock acquisition. |
b5541356 DG |
170 | */ |
171 | static struct ltt_session_list *session_list_ptr; | |
172 | ||
7753dea8 MD |
173 | int ust_consumerd64_fd = -1; |
174 | int ust_consumerd32_fd = -1; | |
175 | ||
fc7a59ce AM |
176 | static const char *consumerd32_bin = |
177 | __stringify(CONFIG_CONSUMERD32_BIN); | |
178 | static const char *consumerd64_bin = | |
179 | __stringify(CONFIG_CONSUMERD64_BIN); | |
ebaeda94 MD |
180 | static const char *consumerd32_libdir = |
181 | __stringify(CONFIG_CONSUMERD32_LIBDIR); | |
182 | static const char *consumerd64_libdir = | |
183 | __stringify(CONFIG_CONSUMERD64_LIBDIR); | |
fb09408a MD |
184 | |
185 | static | |
7753dea8 | 186 | void setup_consumerd_path(void) |
fb09408a | 187 | { |
fc7a59ce | 188 | const char *bin, *libdir; |
fb09408a | 189 | |
7753dea8 MD |
190 | /* |
191 | * Allow INSTALL_BIN_PATH to be used as a target path for the | |
ebaeda94 MD |
192 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
193 | * has not been defined. | |
7753dea8 | 194 | */ |
ebaeda94 | 195 | #if (CAA_BITS_PER_LONG == 32) |
fc7a59ce AM |
196 | if (!consumerd32_bin[0]) { |
197 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
ebaeda94 MD |
198 | } |
199 | if (!consumerd32_libdir[0]) { | |
200 | consumerd32_libdir = INSTALL_LIB_PATH; | |
201 | } | |
202 | #elif (CAA_BITS_PER_LONG == 64) | |
fc7a59ce AM |
203 | if (!consumerd64_bin[0]) { |
204 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
7753dea8 | 205 | } |
ebaeda94 MD |
206 | if (!consumerd64_libdir[0]) { |
207 | consumerd64_libdir = INSTALL_LIB_PATH; | |
7753dea8 MD |
208 | } |
209 | #else | |
210 | #error "Unknown bitness" | |
211 | #endif | |
212 | ||
fb09408a MD |
213 | /* |
214 | * runtime env. var. overrides the build default. | |
215 | */ | |
fc7a59ce AM |
216 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
217 | if (bin) { | |
218 | consumerd32_bin = bin; | |
7753dea8 | 219 | } |
fc7a59ce AM |
220 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
221 | if (bin) { | |
222 | consumerd64_bin = bin; | |
ebaeda94 MD |
223 | } |
224 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); | |
225 | if (libdir) { | |
226 | consumerd32_libdir = libdir; | |
227 | } | |
228 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); | |
229 | if (libdir) { | |
230 | consumerd64_libdir = libdir; | |
fb09408a MD |
231 | } |
232 | } | |
233 | ||
5eb91c98 DG |
234 | /* |
235 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
236 | */ | |
237 | static int create_thread_poll_set(struct lttng_poll_event *events, | |
238 | unsigned int size) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (events == NULL || size == 0) { | |
243 | ret = -1; | |
244 | goto error; | |
245 | } | |
246 | ||
247 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
248 | if (ret < 0) { | |
249 | goto error; | |
250 | } | |
251 | ||
252 | /* Add quit pipe */ | |
253 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
254 | if (ret < 0) { | |
255 | goto error; | |
256 | } | |
257 | ||
258 | return 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Check if the thread quit pipe was triggered. | |
266 | * | |
267 | * Return 1 if it was triggered else 0; | |
268 | */ | |
269 | static int check_thread_quit_pipe(int fd, uint32_t events) | |
270 | { | |
271 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
272 | return 1; | |
273 | } | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
0fdd1e2c DG |
278 | /* |
279 | * Remove modules in reverse load order. | |
280 | */ | |
281 | static int modprobe_remove_kernel_modules(void) | |
282 | { | |
283 | int ret = 0, i; | |
284 | char modprobe[256]; | |
285 | ||
286 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
287 | ret = snprintf(modprobe, sizeof(modprobe), | |
24b487b8 | 288 | "/sbin/modprobe -r -q %s", |
0fdd1e2c DG |
289 | kernel_modules_list[i].name); |
290 | if (ret < 0) { | |
24b487b8 | 291 | perror("snprintf modprobe -r"); |
0fdd1e2c DG |
292 | goto error; |
293 | } | |
294 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
295 | ret = system(modprobe); | |
296 | if (ret == -1) { | |
24b487b8 | 297 | ERR("Unable to launch modprobe -r for module %s", |
0fdd1e2c DG |
298 | kernel_modules_list[i].name); |
299 | } else if (kernel_modules_list[i].required | |
300 | && WEXITSTATUS(ret) != 0) { | |
301 | ERR("Unable to remove module %s", | |
302 | kernel_modules_list[i].name); | |
303 | } else { | |
304 | DBG("Modprobe removal successful %s", | |
305 | kernel_modules_list[i].name); | |
306 | } | |
307 | } | |
308 | ||
309 | error: | |
310 | return ret; | |
311 | } | |
312 | ||
313 | /* | |
314 | * Return group ID of the tracing group or -1 if not found. | |
315 | */ | |
996b65c8 MD |
316 | static gid_t allowed_group(void) |
317 | { | |
318 | struct group *grp; | |
319 | ||
274e143b MD |
320 | if (opt_tracing_group) { |
321 | grp = getgrnam(opt_tracing_group); | |
322 | } else { | |
323 | grp = getgrnam(default_tracing_group); | |
324 | } | |
996b65c8 MD |
325 | if (!grp) { |
326 | return -1; | |
327 | } else { | |
328 | return grp->gr_gid; | |
329 | } | |
330 | } | |
331 | ||
273ea72c | 332 | /* |
5eb91c98 | 333 | * Init thread quit pipe. |
273ea72c DG |
334 | * |
335 | * Return -1 on error or 0 if all pipes are created. | |
336 | */ | |
337 | static int init_thread_quit_pipe(void) | |
338 | { | |
339 | int ret; | |
340 | ||
341 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
342 | if (ret < 0) { | |
343 | perror("thread quit pipe"); | |
344 | goto error; | |
345 | } | |
346 | ||
347 | error: | |
348 | return ret; | |
349 | } | |
350 | ||
fac6795d | 351 | /* |
d063d709 DG |
352 | * Complete teardown of a kernel session. This free all data structure related |
353 | * to a kernel session and update counter. | |
fac6795d | 354 | */ |
1d4b027a | 355 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 356 | { |
8f7a84dd DG |
357 | if (!session->kernel_session) { |
358 | DBG3("No kernel session when tearingdown session"); | |
84ea9c99 | 359 | return; |
8f7a84dd DG |
360 | } |
361 | ||
84ea9c99 | 362 | DBG("Tearing down kernel session"); |
d9800920 | 363 | |
84ea9c99 MD |
364 | /* |
365 | * If a custom kernel consumer was registered, close the socket before | |
366 | * tearing down the complete kernel session structure | |
367 | */ | |
368 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { | |
369 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
fac6795d | 370 | } |
84ea9c99 MD |
371 | |
372 | trace_kernel_destroy_session(session->kernel_session); | |
fac6795d DG |
373 | } |
374 | ||
f6a9efaa DG |
375 | /* |
376 | * Complete teardown of all UST sessions. This will free everything on his path | |
377 | * and destroy the core essence of all ust sessions :) | |
378 | */ | |
379 | static void teardown_ust_session(struct ltt_session *session) | |
380 | { | |
84cd17c6 MD |
381 | int ret; |
382 | ||
8f7a84dd DG |
383 | if (!session->ust_session) { |
384 | DBG3("No UST session when tearingdown session"); | |
f470a390 | 385 | return; |
8f7a84dd DG |
386 | } |
387 | ||
84ea9c99 | 388 | DBG("Tearing down UST session(s)"); |
8f7a84dd | 389 | |
84cd17c6 MD |
390 | ret = ust_app_destroy_trace_all(session->ust_session); |
391 | if (ret) { | |
392 | ERR("Error in ust_app_destroy_trace_all"); | |
393 | } | |
8f7a84dd | 394 | |
f6a9efaa DG |
395 | trace_ust_destroy_session(session->ust_session); |
396 | } | |
397 | ||
099e26bd DG |
398 | /* |
399 | * Stop all threads by closing the thread quit pipe. | |
400 | */ | |
cf3af59e MD |
401 | static void stop_threads(void) |
402 | { | |
5eb91c98 DG |
403 | int ret; |
404 | ||
cf3af59e MD |
405 | /* Stopping all threads */ |
406 | DBG("Terminating all threads"); | |
54d01ffb | 407 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
5eb91c98 DG |
408 | if (ret < 0) { |
409 | ERR("write error on thread quit pipe"); | |
410 | } | |
411 | ||
099e26bd DG |
412 | /* Dispatch thread */ |
413 | dispatch_thread_exit = 1; | |
414 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
415 | } |
416 | ||
fac6795d | 417 | /* |
d063d709 | 418 | * Cleanup the daemon |
fac6795d | 419 | */ |
cf3af59e | 420 | static void cleanup(void) |
fac6795d | 421 | { |
1d4b027a DG |
422 | int ret; |
423 | char *cmd; | |
af9737e9 | 424 | struct ltt_session *sess, *stmp; |
fac6795d | 425 | |
1d4b027a | 426 | DBG("Cleaning up"); |
e07ae692 | 427 | |
67e40797 DG |
428 | DBG("Removing %s directory", rundir); |
429 | ret = asprintf(&cmd, "rm -rf %s", rundir); | |
430 | if (ret < 0) { | |
431 | ERR("asprintf failed. Something is really wrong!"); | |
432 | } | |
5461b305 | 433 | |
67e40797 DG |
434 | /* Remove lttng run directory */ |
435 | ret = system(cmd); | |
436 | if (ret < 0) { | |
437 | ERR("Unable to clean %s", rundir); | |
1d4b027a | 438 | } |
67e40797 | 439 | free(cmd); |
5461b305 | 440 | |
1d4b027a | 441 | DBG("Cleaning up all session"); |
fac6795d | 442 | |
b5541356 | 443 | /* Destroy session list mutex */ |
273ea72c DG |
444 | if (session_list_ptr != NULL) { |
445 | pthread_mutex_destroy(&session_list_ptr->lock); | |
446 | ||
447 | /* Cleanup ALL session */ | |
54d01ffb DG |
448 | cds_list_for_each_entry_safe(sess, stmp, |
449 | &session_list_ptr->head, list) { | |
273ea72c | 450 | teardown_kernel_session(sess); |
f6a9efaa DG |
451 | teardown_ust_session(sess); |
452 | free(sess); | |
273ea72c DG |
453 | } |
454 | } | |
455 | ||
099e26bd | 456 | DBG("Closing all UST sockets"); |
56fff090 | 457 | ust_app_clean_list(); |
099e26bd | 458 | |
3bd1e081 | 459 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
b5541356 | 460 | |
4fba7219 DG |
461 | if (is_root && !opt_no_kernel) { |
462 | DBG2("Closing kernel fd"); | |
463 | close(kernel_tracer_fd); | |
2f50c8a3 DG |
464 | DBG("Unloading kernel modules"); |
465 | modprobe_remove_kernel_modules(); | |
466 | } | |
5eb91c98 DG |
467 | |
468 | close(thread_quit_pipe[0]); | |
469 | close(thread_quit_pipe[1]); | |
421cb601 DG |
470 | |
471 | /* <fun> */ | |
472 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" | |
473 | "Matthew, BEET driven development works!%c[%dm", | |
474 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
475 | /* </fun> */ | |
fac6795d DG |
476 | } |
477 | ||
e065084a | 478 | /* |
d063d709 | 479 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 480 | * |
d063d709 | 481 | * Return lttcomm error code. |
e065084a DG |
482 | */ |
483 | static int send_unix_sock(int sock, void *buf, size_t len) | |
484 | { | |
485 | /* Check valid length */ | |
486 | if (len <= 0) { | |
487 | return -1; | |
488 | } | |
489 | ||
490 | return lttcomm_send_unix_sock(sock, buf, len); | |
491 | } | |
492 | ||
5461b305 | 493 | /* |
d063d709 | 494 | * Free memory of a command context structure. |
5461b305 | 495 | */ |
a2fb29a5 | 496 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 497 | { |
a2fb29a5 DG |
498 | DBG("Clean command context structure"); |
499 | if (*cmd_ctx) { | |
500 | if ((*cmd_ctx)->llm) { | |
501 | free((*cmd_ctx)->llm); | |
5461b305 | 502 | } |
a2fb29a5 DG |
503 | if ((*cmd_ctx)->lsm) { |
504 | free((*cmd_ctx)->lsm); | |
5461b305 | 505 | } |
a2fb29a5 DG |
506 | free(*cmd_ctx); |
507 | *cmd_ctx = NULL; | |
5461b305 DG |
508 | } |
509 | } | |
510 | ||
f3ed775e | 511 | /* |
d063d709 | 512 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 513 | */ |
2bdd86d4 | 514 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
3bd1e081 | 515 | int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
516 | { |
517 | int ret; | |
f3ed775e | 518 | struct ltt_kernel_stream *stream; |
3bd1e081 | 519 | struct lttcomm_consumer_msg lkm; |
f3ed775e | 520 | |
3bd1e081 | 521 | DBG("Sending streams of channel %s to kernel consumer", |
54d01ffb | 522 | channel->channel->name); |
f3ed775e | 523 | |
3bd1e081 MD |
524 | /* Send channel */ |
525 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
526 | lkm.u.channel.channel_key = channel->fd; | |
527 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
528 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
2bdd86d4 | 529 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
3bd1e081 | 530 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
f3ed775e | 531 | if (ret < 0) { |
3bd1e081 | 532 | perror("send consumer channel"); |
f3ed775e DG |
533 | goto error; |
534 | } | |
535 | ||
3bd1e081 | 536 | /* Send streams */ |
7a485870 | 537 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
3bd1e081 MD |
538 | if (!stream->fd) { |
539 | continue; | |
540 | } | |
541 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
542 | lkm.u.stream.channel_key = channel->fd; | |
543 | lkm.u.stream.stream_key = stream->fd; | |
544 | lkm.u.stream.state = stream->state; | |
545 | lkm.u.stream.output = channel->channel->attr.output; | |
546 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
547 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
548 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
549 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
550 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
551 | if (ret < 0) { | |
552 | perror("send consumer stream"); | |
553 | goto error; | |
554 | } | |
555 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
556 | if (ret < 0) { | |
557 | perror("send consumer stream ancillary data"); | |
558 | goto error; | |
f3ed775e DG |
559 | } |
560 | } | |
561 | ||
3bd1e081 | 562 | DBG("consumer channel streams sent"); |
f3ed775e DG |
563 | |
564 | return 0; | |
565 | ||
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
570 | /* | |
d063d709 | 571 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 572 | */ |
2bdd86d4 | 573 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
3bd1e081 | 574 | struct ltt_kernel_session *session) |
f3ed775e DG |
575 | { |
576 | int ret; | |
577 | struct ltt_kernel_channel *chan; | |
3bd1e081 MD |
578 | struct lttcomm_consumer_msg lkm; |
579 | int sock = session->consumer_fd; | |
7a485870 DG |
580 | |
581 | DBG("Sending metadata stream fd"); | |
582 | ||
2bdd86d4 | 583 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
d9800920 | 584 | if (session->consumer_fd == 0) { |
3bd1e081 | 585 | session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
586 | } |
587 | ||
7a485870 | 588 | if (session->metadata_stream_fd != 0) { |
3bd1e081 MD |
589 | /* Send metadata channel fd */ |
590 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
591 | lkm.u.channel.channel_key = session->metadata->fd; | |
592 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
593 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
594 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); | |
595 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
596 | if (ret < 0) { | |
597 | perror("send consumer channel"); | |
598 | goto error; | |
599 | } | |
600 | ||
601 | /* Send metadata stream fd */ | |
602 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
603 | lkm.u.stream.channel_key = session->metadata->fd; | |
604 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
605 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
606 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
607 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
608 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); | |
609 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
610 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
611 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
612 | if (ret < 0) { | |
613 | perror("send consumer stream"); | |
614 | goto error; | |
615 | } | |
616 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
7a485870 | 617 | if (ret < 0) { |
3bd1e081 | 618 | perror("send consumer stream"); |
7a485870 DG |
619 | goto error; |
620 | } | |
621 | } | |
f3ed775e | 622 | |
f3ed775e | 623 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
2bdd86d4 MD |
624 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
625 | if (ret < 0) { | |
626 | goto error; | |
627 | } | |
628 | } | |
629 | ||
630 | DBG("consumer fds (metadata and channel streams) sent"); | |
631 | ||
632 | return 0; | |
633 | ||
634 | error: | |
635 | return ret; | |
636 | } | |
637 | ||
fac6795d | 638 | /* |
0fdd1e2c | 639 | * Notify UST applications using the shm mmap futex. |
fac6795d | 640 | */ |
0fdd1e2c | 641 | static int notify_ust_apps(int active) |
fac6795d | 642 | { |
0fdd1e2c | 643 | char *wait_shm_mmap; |
fac6795d | 644 | |
0fdd1e2c | 645 | DBG("Notifying applications of session daemon state: %d", active); |
e07ae692 | 646 | |
0fdd1e2c DG |
647 | /* See shm.c for this call implying mmap, shm and futex calls */ |
648 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); | |
649 | if (wait_shm_mmap == NULL) { | |
fac6795d DG |
650 | goto error; |
651 | } | |
652 | ||
0fdd1e2c DG |
653 | /* Wake waiting process */ |
654 | futex_wait_update((int32_t *) wait_shm_mmap, active); | |
655 | ||
656 | /* Apps notified successfully */ | |
657 | return 0; | |
fac6795d DG |
658 | |
659 | error: | |
0fdd1e2c | 660 | return -1; |
fac6795d DG |
661 | } |
662 | ||
e065084a | 663 | /* |
d063d709 DG |
664 | * Setup the outgoing data buffer for the response (llm) by allocating the |
665 | * right amount of memory and copying the original information from the lsm | |
666 | * structure. | |
ca95a216 | 667 | * |
d063d709 | 668 | * Return total size of the buffer pointed by buf. |
ca95a216 | 669 | */ |
5461b305 | 670 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 671 | { |
f3ed775e | 672 | int ret, buf_size; |
ca95a216 | 673 | |
f3ed775e | 674 | buf_size = size; |
5461b305 | 675 | |
ba7f0ae5 | 676 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
5461b305 | 677 | if (cmd_ctx->llm == NULL) { |
ba7f0ae5 | 678 | perror("zmalloc"); |
5461b305 | 679 | ret = -ENOMEM; |
ca95a216 DG |
680 | goto error; |
681 | } | |
682 | ||
5461b305 DG |
683 | /* Copy common data */ |
684 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 685 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 686 | |
5461b305 DG |
687 | cmd_ctx->llm->data_size = size; |
688 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
689 | ||
ca95a216 DG |
690 | return buf_size; |
691 | ||
692 | error: | |
693 | return ret; | |
694 | } | |
695 | ||
7a485870 | 696 | /* |
5eb91c98 | 697 | * Update the kernel poll set of all channel fd available over all tracing |
d063d709 | 698 | * session. Add the wakeup pipe at the end of the set. |
7a485870 | 699 | */ |
5eb91c98 | 700 | static int update_kernel_poll(struct lttng_poll_event *events) |
7a485870 | 701 | { |
5eb91c98 | 702 | int ret; |
7a485870 DG |
703 | struct ltt_session *session; |
704 | struct ltt_kernel_channel *channel; | |
705 | ||
5eb91c98 | 706 | DBG("Updating kernel poll set"); |
7a485870 | 707 | |
54d01ffb | 708 | session_lock_list(); |
b5541356 | 709 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 710 | session_lock(session); |
7a485870 | 711 | if (session->kernel_session == NULL) { |
54d01ffb | 712 | session_unlock(session); |
7a485870 DG |
713 | continue; |
714 | } | |
7a485870 | 715 | |
54d01ffb DG |
716 | cds_list_for_each_entry(channel, |
717 | &session->kernel_session->channel_list.head, list) { | |
5eb91c98 DG |
718 | /* Add channel fd to the kernel poll set */ |
719 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); | |
720 | if (ret < 0) { | |
54d01ffb | 721 | session_unlock(session); |
5eb91c98 DG |
722 | goto error; |
723 | } | |
724 | DBG("Channel fd %d added to kernel set", channel->fd); | |
7a485870 | 725 | } |
54d01ffb | 726 | session_unlock(session); |
7a485870 | 727 | } |
54d01ffb | 728 | session_unlock_list(); |
7a485870 | 729 | |
5eb91c98 | 730 | return 0; |
7a485870 DG |
731 | |
732 | error: | |
54d01ffb | 733 | session_unlock_list(); |
7a485870 DG |
734 | return -1; |
735 | } | |
736 | ||
737 | /* | |
54d01ffb | 738 | * Find the channel fd from 'fd' over all tracing session. When found, check |
d063d709 | 739 | * for new channel stream and send those stream fds to the kernel consumer. |
7a485870 | 740 | * |
d063d709 | 741 | * Useful for CPU hotplug feature. |
7a485870 | 742 | */ |
2bdd86d4 | 743 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
7a485870 DG |
744 | { |
745 | int ret = 0; | |
746 | struct ltt_session *session; | |
747 | struct ltt_kernel_channel *channel; | |
748 | ||
749 | DBG("Updating kernel streams for channel fd %d", fd); | |
750 | ||
54d01ffb | 751 | session_lock_list(); |
b5541356 | 752 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
54d01ffb | 753 | session_lock(session); |
7a485870 | 754 | if (session->kernel_session == NULL) { |
54d01ffb | 755 | session_unlock(session); |
7a485870 DG |
756 | continue; |
757 | } | |
d9800920 DG |
758 | |
759 | /* This is not suppose to be 0 but this is an extra security check */ | |
760 | if (session->kernel_session->consumer_fd == 0) { | |
3bd1e081 | 761 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
d9800920 DG |
762 | } |
763 | ||
5eb91c98 DG |
764 | cds_list_for_each_entry(channel, |
765 | &session->kernel_session->channel_list.head, list) { | |
7a485870 DG |
766 | if (channel->fd == fd) { |
767 | DBG("Channel found, updating kernel streams"); | |
768 | ret = kernel_open_channel_stream(channel); | |
769 | if (ret < 0) { | |
b3c750d2 | 770 | goto error; |
7a485870 | 771 | } |
d9800920 | 772 | |
7a485870 | 773 | /* |
5eb91c98 DG |
774 | * Have we already sent fds to the consumer? If yes, it means |
775 | * that tracing is started so it is safe to send our updated | |
776 | * stream fds. | |
7a485870 | 777 | */ |
3bd1e081 | 778 | if (session->kernel_session->consumer_fds_sent == 1) { |
2bdd86d4 | 779 | ret = send_kconsumer_channel_streams(consumer_data, |
5eb91c98 | 780 | session->kernel_session->consumer_fd, channel); |
7a485870 | 781 | if (ret < 0) { |
b3c750d2 | 782 | goto error; |
7a485870 DG |
783 | } |
784 | } | |
b3c750d2 | 785 | goto error; |
7a485870 DG |
786 | } |
787 | } | |
54d01ffb | 788 | session_unlock(session); |
7a485870 | 789 | } |
54d01ffb | 790 | session_unlock_list(); |
b3c750d2 | 791 | return ret; |
7a485870 | 792 | |
b3c750d2 | 793 | error: |
54d01ffb DG |
794 | session_unlock(session); |
795 | session_unlock_list(); | |
7a485870 DG |
796 | return ret; |
797 | } | |
798 | ||
487cf67c DG |
799 | /* |
800 | * For each tracing session, update newly registered apps. | |
801 | */ | |
802 | static void update_ust_app(int app_sock) | |
803 | { | |
804 | struct ltt_session *sess, *stmp; | |
805 | ||
806 | /* For all tracing session(s) */ | |
807 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { | |
421cb601 DG |
808 | if (sess->ust_session) { |
809 | ust_app_global_update(sess->ust_session, app_sock); | |
810 | } | |
487cf67c DG |
811 | } |
812 | } | |
813 | ||
7a485870 | 814 | /* |
d063d709 | 815 | * This thread manage event coming from the kernel. |
7a485870 | 816 | * |
d063d709 DG |
817 | * Features supported in this thread: |
818 | * -) CPU Hotplug | |
7a485870 DG |
819 | */ |
820 | static void *thread_manage_kernel(void *data) | |
821 | { | |
5eb91c98 DG |
822 | int ret, i, pollfd, update_poll_flag = 1; |
823 | uint32_t revents, nb_fd; | |
7a485870 | 824 | char tmp; |
5eb91c98 | 825 | struct lttng_poll_event events; |
7a485870 DG |
826 | |
827 | DBG("Thread manage kernel started"); | |
828 | ||
5eb91c98 DG |
829 | ret = create_thread_poll_set(&events, 2); |
830 | if (ret < 0) { | |
831 | goto error; | |
832 | } | |
833 | ||
834 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); | |
835 | if (ret < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
7a485870 DG |
839 | while (1) { |
840 | if (update_poll_flag == 1) { | |
5f822d0a DG |
841 | /* |
842 | * Reset number of fd in the poll set. Always 2 since there is the thread | |
843 | * quit pipe and the kernel pipe. | |
844 | */ | |
845 | events.nb_fd = 2; | |
846 | ||
5eb91c98 DG |
847 | ret = update_kernel_poll(&events); |
848 | if (ret < 0) { | |
7a485870 DG |
849 | goto error; |
850 | } | |
851 | update_poll_flag = 0; | |
852 | } | |
853 | ||
5eb91c98 DG |
854 | nb_fd = LTTNG_POLL_GETNB(&events); |
855 | ||
856 | DBG("Thread kernel polling on %d fds", nb_fd); | |
857 | ||
858 | /* Zeroed the poll events */ | |
859 | lttng_poll_reset(&events); | |
7a485870 DG |
860 | |
861 | /* Poll infinite value of time */ | |
5eb91c98 | 862 | ret = lttng_poll_wait(&events, -1); |
7a485870 | 863 | if (ret < 0) { |
7a485870 DG |
864 | goto error; |
865 | } else if (ret == 0) { | |
866 | /* Should not happen since timeout is infinite */ | |
85611738 DG |
867 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
868 | "This should not have happened! Continuing..."); | |
7a485870 DG |
869 | continue; |
870 | } | |
871 | ||
5eb91c98 DG |
872 | for (i = 0; i < nb_fd; i++) { |
873 | /* Fetch once the poll data */ | |
874 | revents = LTTNG_POLL_GETEV(&events, i); | |
875 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
7a485870 | 876 | |
5eb91c98 DG |
877 | /* Thread quit pipe has been closed. Killing thread. */ |
878 | ret = check_thread_quit_pipe(pollfd, revents); | |
879 | if (ret) { | |
880 | goto error; | |
881 | } | |
7a485870 | 882 | |
5eb91c98 DG |
883 | /* Check for data on kernel pipe */ |
884 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { | |
885 | ret = read(kernel_poll_pipe[0], &tmp, 1); | |
886 | update_poll_flag = 1; | |
887 | continue; | |
888 | } else { | |
889 | /* | |
890 | * New CPU detected by the kernel. Adding kernel stream to | |
891 | * kernel session and updating the kernel consumer | |
892 | */ | |
893 | if (revents & LPOLLIN) { | |
2bdd86d4 | 894 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
5eb91c98 DG |
895 | if (ret < 0) { |
896 | continue; | |
897 | } | |
898 | break; | |
899 | /* | |
900 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP | |
901 | * and unregister kernel stream at this point. | |
902 | */ | |
7a485870 | 903 | } |
7a485870 DG |
904 | } |
905 | } | |
906 | } | |
907 | ||
908 | error: | |
909 | DBG("Kernel thread dying"); | |
273ea72c DG |
910 | close(kernel_poll_pipe[0]); |
911 | close(kernel_poll_pipe[1]); | |
5eb91c98 DG |
912 | |
913 | lttng_poll_clean(&events); | |
914 | ||
7a485870 DG |
915 | return NULL; |
916 | } | |
917 | ||
1d4b027a | 918 | /* |
3bd1e081 | 919 | * This thread manage the consumer error sent back to the session daemon. |
1d4b027a | 920 | */ |
3bd1e081 | 921 | static void *thread_manage_consumer(void *data) |
1d4b027a | 922 | { |
5eb91c98 DG |
923 | int sock = 0, i, ret, pollfd; |
924 | uint32_t revents, nb_fd; | |
1d4b027a | 925 | enum lttcomm_return_code code; |
5eb91c98 | 926 | struct lttng_poll_event events; |
3bd1e081 | 927 | struct consumer_data *consumer_data = data; |
1d4b027a | 928 | |
3bd1e081 | 929 | DBG("[thread] Manage consumer started"); |
1d4b027a | 930 | |
3bd1e081 | 931 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
932 | if (ret < 0) { |
933 | goto error; | |
934 | } | |
935 | ||
5eb91c98 DG |
936 | /* |
937 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. | |
938 | * Nothing more will be added to this poll set. | |
939 | */ | |
940 | ret = create_thread_poll_set(&events, 2); | |
941 | if (ret < 0) { | |
942 | goto error; | |
943 | } | |
273ea72c | 944 | |
3bd1e081 | 945 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
5eb91c98 DG |
946 | if (ret < 0) { |
947 | goto error; | |
948 | } | |
949 | ||
950 | nb_fd = LTTNG_POLL_GETNB(&events); | |
273ea72c DG |
951 | |
952 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 953 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 954 | if (ret < 0) { |
273ea72c DG |
955 | goto error; |
956 | } | |
957 | ||
5eb91c98 DG |
958 | for (i = 0; i < nb_fd; i++) { |
959 | /* Fetch once the poll data */ | |
960 | revents = LTTNG_POLL_GETEV(&events, i); | |
961 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
962 | ||
963 | /* Thread quit pipe has been closed. Killing thread. */ | |
964 | ret = check_thread_quit_pipe(pollfd, revents); | |
965 | if (ret) { | |
966 | goto error; | |
967 | } | |
968 | ||
969 | /* Event on the registration socket */ | |
3bd1e081 | 970 | if (pollfd == consumer_data->err_sock) { |
5eb91c98 | 971 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
3bd1e081 | 972 | ERR("consumer err socket poll error"); |
5eb91c98 DG |
973 | goto error; |
974 | } | |
975 | } | |
273ea72c DG |
976 | } |
977 | ||
3bd1e081 | 978 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
1d4b027a DG |
979 | if (sock < 0) { |
980 | goto error; | |
981 | } | |
982 | ||
3bd1e081 | 983 | DBG2("Receiving code from consumer err_sock"); |
ee0b0061 | 984 | |
712ea556 | 985 | /* Getting status code from kconsumerd */ |
54d01ffb DG |
986 | ret = lttcomm_recv_unix_sock(sock, &code, |
987 | sizeof(enum lttcomm_return_code)); | |
1d4b027a DG |
988 | if (ret <= 0) { |
989 | goto error; | |
990 | } | |
991 | ||
3bd1e081 MD |
992 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
993 | consumer_data->cmd_sock = | |
994 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); | |
995 | if (consumer_data->cmd_sock < 0) { | |
996 | sem_post(&consumer_data->sem); | |
48842b30 | 997 | PERROR("consumer connect"); |
1d4b027a DG |
998 | goto error; |
999 | } | |
1000 | /* Signal condition to tell that the kconsumerd is ready */ | |
3bd1e081 MD |
1001 | sem_post(&consumer_data->sem); |
1002 | DBG("consumer command socket ready"); | |
1d4b027a | 1003 | } else { |
3bd1e081 | 1004 | ERR("consumer error when waiting for SOCK_READY : %s", |
1d4b027a DG |
1005 | lttcomm_get_readable_code(-code)); |
1006 | goto error; | |
1007 | } | |
1008 | ||
54d01ffb | 1009 | /* Remove the kconsumerd error sock since we've established a connexion */ |
3bd1e081 | 1010 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
72079cae | 1011 | if (ret < 0) { |
72079cae DG |
1012 | goto error; |
1013 | } | |
1014 | ||
5eb91c98 DG |
1015 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
1016 | if (ret < 0) { | |
72079cae | 1017 | goto error; |
5eb91c98 DG |
1018 | } |
1019 | ||
1020 | /* Update number of fd */ | |
1021 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1022 | ||
1023 | /* Inifinite blocking call, waiting for transmission */ | |
1024 | ret = lttng_poll_wait(&events, -1); | |
1025 | if (ret < 0) { | |
72079cae DG |
1026 | goto error; |
1027 | } | |
1028 | ||
5eb91c98 DG |
1029 | for (i = 0; i < nb_fd; i++) { |
1030 | /* Fetch once the poll data */ | |
1031 | revents = LTTNG_POLL_GETEV(&events, i); | |
1032 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1033 | ||
1034 | /* Thread quit pipe has been closed. Killing thread. */ | |
1035 | ret = check_thread_quit_pipe(pollfd, revents); | |
1036 | if (ret) { | |
1037 | goto error; | |
1038 | } | |
1039 | ||
1040 | /* Event on the kconsumerd socket */ | |
1041 | if (pollfd == sock) { | |
1042 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3bd1e081 | 1043 | ERR("consumer err socket second poll error"); |
5eb91c98 DG |
1044 | goto error; |
1045 | } | |
1046 | } | |
1047 | } | |
1048 | ||
712ea556 | 1049 | /* Wait for any kconsumerd error */ |
54d01ffb DG |
1050 | ret = lttcomm_recv_unix_sock(sock, &code, |
1051 | sizeof(enum lttcomm_return_code)); | |
712ea556 | 1052 | if (ret <= 0) { |
3bd1e081 | 1053 | ERR("consumer closed the command socket"); |
712ea556 | 1054 | goto error; |
6f61d021 | 1055 | } |
1d4b027a | 1056 | |
3bd1e081 | 1057 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
712ea556 | 1058 | |
1d4b027a | 1059 | error: |
3bd1e081 MD |
1060 | DBG("consumer thread dying"); |
1061 | close(consumer_data->err_sock); | |
1062 | close(consumer_data->cmd_sock); | |
5eb91c98 | 1063 | close(sock); |
273ea72c | 1064 | |
3bd1e081 MD |
1065 | unlink(consumer_data->err_unix_sock_path); |
1066 | unlink(consumer_data->cmd_unix_sock_path); | |
1067 | consumer_data->pid = 0; | |
1d4b027a | 1068 | |
5eb91c98 | 1069 | lttng_poll_clean(&events); |
0177d773 | 1070 | |
5eb91c98 | 1071 | return NULL; |
099e26bd DG |
1072 | } |
1073 | ||
099e26bd DG |
1074 | /* |
1075 | * This thread manage application communication. | |
1d4b027a DG |
1076 | */ |
1077 | static void *thread_manage_apps(void *data) | |
099e26bd | 1078 | { |
5eb91c98 DG |
1079 | int i, ret, pollfd; |
1080 | uint32_t revents, nb_fd; | |
099e26bd | 1081 | struct ust_command ust_cmd; |
5eb91c98 | 1082 | struct lttng_poll_event events; |
099e26bd DG |
1083 | |
1084 | DBG("[thread] Manage application started"); | |
1085 | ||
f6a9efaa DG |
1086 | rcu_register_thread(); |
1087 | rcu_thread_online(); | |
1088 | ||
5eb91c98 DG |
1089 | ret = create_thread_poll_set(&events, 2); |
1090 | if (ret < 0) { | |
1091 | goto error; | |
1092 | } | |
099e26bd | 1093 | |
5eb91c98 DG |
1094 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
1095 | if (ret < 0) { | |
1096 | goto error; | |
1097 | } | |
099e26bd | 1098 | |
5eb91c98 DG |
1099 | while (1) { |
1100 | /* Zeroed the events structure */ | |
1101 | lttng_poll_reset(&events); | |
0177d773 | 1102 | |
5eb91c98 | 1103 | nb_fd = LTTNG_POLL_GETNB(&events); |
099e26bd DG |
1104 | |
1105 | DBG("Apps thread polling on %d fds", nb_fd); | |
1106 | ||
1107 | /* Inifinite blocking call, waiting for transmission */ | |
5eb91c98 | 1108 | ret = lttng_poll_wait(&events, -1); |
099e26bd | 1109 | if (ret < 0) { |
099e26bd DG |
1110 | goto error; |
1111 | } | |
1112 | ||
5eb91c98 DG |
1113 | for (i = 0; i < nb_fd; i++) { |
1114 | /* Fetch once the poll data */ | |
1115 | revents = LTTNG_POLL_GETEV(&events, i); | |
1116 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1117 | ||
1118 | /* Thread quit pipe has been closed. Killing thread. */ | |
1119 | ret = check_thread_quit_pipe(pollfd, revents); | |
1120 | if (ret) { | |
099e26bd | 1121 | goto error; |
5eb91c98 | 1122 | } |
099e26bd | 1123 | |
5eb91c98 DG |
1124 | /* Inspect the apps cmd pipe */ |
1125 | if (pollfd == apps_cmd_pipe[0]) { | |
1126 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1127 | ERR("Apps command pipe error"); | |
0177d773 | 1128 | goto error; |
5eb91c98 DG |
1129 | } else if (revents & LPOLLIN) { |
1130 | /* Empty pipe */ | |
1131 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
1132 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
1133 | perror("read apps cmd pipe"); | |
1134 | goto error; | |
1135 | } | |
099e26bd | 1136 | |
5eb91c98 | 1137 | /* Register applicaton to the session daemon */ |
56fff090 | 1138 | ret = ust_app_register(&ust_cmd.reg_msg, |
54d01ffb | 1139 | ust_cmd.sock); |
88ff5b7f | 1140 | if (ret == -ENOMEM) { |
5eb91c98 | 1141 | goto error; |
88ff5b7f MD |
1142 | } else if (ret < 0) { |
1143 | break; | |
5eb91c98 DG |
1144 | } |
1145 | ||
acc7b41b MD |
1146 | /* |
1147 | * Add channel(s) and event(s) to newly registered apps | |
1148 | * from lttng global UST domain. | |
1149 | */ | |
1150 | update_ust_app(ust_cmd.sock); | |
1151 | ||
5eb91c98 DG |
1152 | ret = ustctl_register_done(ust_cmd.sock); |
1153 | if (ret < 0) { | |
1154 | /* | |
1155 | * If the registration is not possible, we simply | |
1156 | * unregister the apps and continue | |
1157 | */ | |
56fff090 | 1158 | ust_app_unregister(ust_cmd.sock); |
5eb91c98 DG |
1159 | } else { |
1160 | /* | |
1161 | * We just need here to monitor the close of the UST | |
1162 | * socket and poll set monitor those by default. | |
1163 | */ | |
1164 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); | |
1165 | if (ret < 0) { | |
1166 | goto error; | |
1167 | } | |
1168 | ||
54d01ffb DG |
1169 | DBG("Apps with sock %d added to poll set", |
1170 | ust_cmd.sock); | |
5eb91c98 | 1171 | } |
487cf67c | 1172 | |
5eb91c98 | 1173 | break; |
0177d773 | 1174 | } |
5eb91c98 DG |
1175 | } else { |
1176 | /* | |
54d01ffb DG |
1177 | * At this point, we know that a registered application made |
1178 | * the event at poll_wait. | |
5eb91c98 DG |
1179 | */ |
1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1181 | /* Removing from the poll set */ | |
1182 | ret = lttng_poll_del(&events, pollfd); | |
1183 | if (ret < 0) { | |
1184 | goto error; | |
1185 | } | |
099e26bd | 1186 | |
b9d9b220 | 1187 | /* Socket closed on remote end. */ |
56fff090 | 1188 | ust_app_unregister(pollfd); |
5eb91c98 DG |
1189 | break; |
1190 | } | |
099e26bd DG |
1191 | } |
1192 | } | |
099e26bd DG |
1193 | } |
1194 | ||
1195 | error: | |
1196 | DBG("Application communication apps dying"); | |
1197 | close(apps_cmd_pipe[0]); | |
1198 | close(apps_cmd_pipe[1]); | |
1199 | ||
5eb91c98 | 1200 | lttng_poll_clean(&events); |
099e26bd | 1201 | |
f6a9efaa DG |
1202 | rcu_thread_offline(); |
1203 | rcu_unregister_thread(); | |
099e26bd DG |
1204 | return NULL; |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Dispatch request from the registration threads to the application | |
1209 | * communication thread. | |
1210 | */ | |
1211 | static void *thread_dispatch_ust_registration(void *data) | |
1212 | { | |
1213 | int ret; | |
1214 | struct cds_wfq_node *node; | |
1215 | struct ust_command *ust_cmd = NULL; | |
1216 | ||
1217 | DBG("[thread] Dispatch UST command started"); | |
1218 | ||
1219 | while (!dispatch_thread_exit) { | |
1220 | /* Atomically prepare the queue futex */ | |
1221 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
1222 | ||
1223 | do { | |
1224 | /* Dequeue command for registration */ | |
1225 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1226 | if (node == NULL) { | |
00a17c97 | 1227 | DBG("Woken up but nothing in the UST command queue"); |
099e26bd DG |
1228 | /* Continue thread execution */ |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1233 | ||
2f50c8a3 DG |
1234 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1235 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1236 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1237 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1238 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1239 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1240 | /* |
1241 | * Inform apps thread of the new application registration. This | |
1242 | * call is blocking so we can be assured that the data will be read | |
1243 | * at some point in time or wait to the end of the world :) | |
1244 | */ | |
1245 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1246 | sizeof(struct ust_command)); | |
1247 | if (ret < 0) { | |
1248 | perror("write apps cmd pipe"); | |
1249 | if (errno == EBADF) { | |
1250 | /* | |
1251 | * We can't inform the application thread to process | |
1252 | * registration. We will exit or else application | |
1253 | * registration will not occur and tracing will never | |
1254 | * start. | |
1255 | */ | |
1256 | goto error; | |
1257 | } | |
1258 | } | |
1259 | free(ust_cmd); | |
1260 | } while (node != NULL); | |
1261 | ||
1262 | /* Futex wait on queue. Blocking call on futex() */ | |
1263 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1264 | } | |
1265 | ||
1266 | error: | |
1267 | DBG("Dispatch thread dying"); | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * This thread manage application registration. | |
1273 | */ | |
1274 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1275 | { |
5eb91c98 DG |
1276 | int sock = 0, i, ret, pollfd; |
1277 | uint32_t revents, nb_fd; | |
1278 | struct lttng_poll_event events; | |
099e26bd DG |
1279 | /* |
1280 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1281 | * freed in the manage apps thread. | |
1282 | */ | |
1283 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1284 | |
099e26bd | 1285 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1286 | |
1287 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1288 | if (ret < 0) { | |
1289 | goto error; | |
1290 | } | |
1291 | ||
5eb91c98 DG |
1292 | /* |
1293 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing | |
1294 | * more will be added to this poll set. | |
1295 | */ | |
1296 | ret = create_thread_poll_set(&events, 2); | |
1297 | if (ret < 0) { | |
1298 | goto error; | |
1299 | } | |
273ea72c | 1300 | |
5eb91c98 DG |
1301 | /* Add the application registration socket */ |
1302 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); | |
1303 | if (ret < 0) { | |
1304 | goto error; | |
1305 | } | |
273ea72c | 1306 | |
1d4b027a | 1307 | /* Notify all applications to register */ |
0fdd1e2c DG |
1308 | ret = notify_ust_apps(1); |
1309 | if (ret < 0) { | |
1310 | ERR("Failed to notify applications or create the wait shared memory.\n" | |
54d01ffb DG |
1311 | "Execution continues but there might be problem for already\n" |
1312 | "running applications that wishes to register."); | |
0fdd1e2c | 1313 | } |
1d4b027a DG |
1314 | |
1315 | while (1) { | |
1316 | DBG("Accepting application registration"); | |
273ea72c | 1317 | |
5eb91c98 DG |
1318 | nb_fd = LTTNG_POLL_GETNB(&events); |
1319 | ||
273ea72c | 1320 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 1321 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 1322 | if (ret < 0) { |
273ea72c DG |
1323 | goto error; |
1324 | } | |
1325 | ||
5eb91c98 DG |
1326 | for (i = 0; i < nb_fd; i++) { |
1327 | /* Fetch once the poll data */ | |
1328 | revents = LTTNG_POLL_GETEV(&events, i); | |
1329 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
273ea72c | 1330 | |
5eb91c98 DG |
1331 | /* Thread quit pipe has been closed. Killing thread. */ |
1332 | ret = check_thread_quit_pipe(pollfd, revents); | |
1333 | if (ret) { | |
90014c57 DG |
1334 | goto error; |
1335 | } | |
1d4b027a | 1336 | |
5eb91c98 DG |
1337 | /* Event on the registration socket */ |
1338 | if (pollfd == apps_sock) { | |
1339 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1340 | ERR("Register apps socket poll error"); | |
1341 | goto error; | |
1342 | } else if (revents & LPOLLIN) { | |
1343 | sock = lttcomm_accept_unix_sock(apps_sock); | |
1344 | if (sock < 0) { | |
1345 | goto error; | |
1346 | } | |
099e26bd | 1347 | |
5eb91c98 | 1348 | /* Create UST registration command for enqueuing */ |
ba7f0ae5 | 1349 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
5eb91c98 | 1350 | if (ust_cmd == NULL) { |
ba7f0ae5 | 1351 | perror("ust command zmalloc"); |
5eb91c98 DG |
1352 | goto error; |
1353 | } | |
1d4b027a | 1354 | |
5eb91c98 DG |
1355 | /* |
1356 | * Using message-based transmissions to ensure we don't | |
1357 | * have to deal with partially received messages. | |
1358 | */ | |
1359 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, | |
1360 | sizeof(struct ust_register_msg)); | |
1361 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { | |
1362 | if (ret < 0) { | |
1363 | perror("lttcomm_recv_unix_sock register apps"); | |
1364 | } else { | |
1365 | ERR("Wrong size received on apps register"); | |
1366 | } | |
1367 | free(ust_cmd); | |
1368 | close(sock); | |
1369 | continue; | |
1370 | } | |
099e26bd | 1371 | |
5eb91c98 | 1372 | ust_cmd->sock = sock; |
099e26bd | 1373 | |
5eb91c98 DG |
1374 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1375 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1376 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1377 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1378 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1379 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
54d01ffb | 1380 | |
5eb91c98 DG |
1381 | /* |
1382 | * Lock free enqueue the registration request. The red pill | |
54d01ffb | 1383 | * has been taken! This apps will be part of the *system*. |
5eb91c98 DG |
1384 | */ |
1385 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1386 | ||
1387 | /* | |
1388 | * Wake the registration queue futex. Implicit memory | |
1389 | * barrier with the exchange in cds_wfq_enqueue. | |
1390 | */ | |
1391 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1392 | } | |
1393 | } | |
90014c57 | 1394 | } |
1d4b027a DG |
1395 | } |
1396 | ||
1397 | error: | |
0fdd1e2c DG |
1398 | DBG("UST Registration thread dying"); |
1399 | ||
1400 | /* Notify that the registration thread is gone */ | |
1401 | notify_ust_apps(0); | |
1402 | ||
1403 | close(apps_sock); | |
1404 | close(sock); | |
273ea72c | 1405 | unlink(apps_unix_sock_path); |
0fdd1e2c | 1406 | |
5eb91c98 DG |
1407 | lttng_poll_clean(&events); |
1408 | ||
1d4b027a DG |
1409 | return NULL; |
1410 | } | |
1411 | ||
8c0faa1d | 1412 | /* |
3bd1e081 | 1413 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
d063d709 | 1414 | * exec or it will fails. |
8c0faa1d | 1415 | */ |
3bd1e081 | 1416 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
8c0faa1d DG |
1417 | { |
1418 | int ret; | |
ee0b0061 DG |
1419 | struct timespec timeout; |
1420 | ||
1421 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; | |
1422 | timeout.tv_nsec = 0; | |
8c0faa1d DG |
1423 | |
1424 | /* Setup semaphore */ | |
3bd1e081 | 1425 | ret = sem_init(&consumer_data->sem, 0, 0); |
ee0b0061 | 1426 | if (ret < 0) { |
3bd1e081 | 1427 | PERROR("sem_init consumer semaphore"); |
ee0b0061 DG |
1428 | goto error; |
1429 | } | |
8c0faa1d | 1430 | |
3bd1e081 MD |
1431 | ret = pthread_create(&consumer_data->thread, NULL, |
1432 | thread_manage_consumer, consumer_data); | |
8c0faa1d | 1433 | if (ret != 0) { |
3bd1e081 | 1434 | PERROR("pthread_create consumer"); |
ee0b0061 | 1435 | ret = -1; |
8c0faa1d DG |
1436 | goto error; |
1437 | } | |
1438 | ||
ee0b0061 DG |
1439 | /* Get time for sem_timedwait absolute timeout */ |
1440 | ret = clock_gettime(CLOCK_REALTIME, &timeout); | |
1441 | if (ret < 0) { | |
3bd1e081 | 1442 | PERROR("clock_gettime spawn consumer"); |
ee0b0061 | 1443 | /* Infinite wait for the kconsumerd thread to be ready */ |
3bd1e081 | 1444 | ret = sem_wait(&consumer_data->sem); |
ee0b0061 DG |
1445 | } else { |
1446 | /* Normal timeout if the gettime was successful */ | |
1447 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; | |
3bd1e081 | 1448 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
ee0b0061 | 1449 | } |
8c0faa1d | 1450 | |
ee0b0061 DG |
1451 | if (ret < 0) { |
1452 | if (errno == ETIMEDOUT) { | |
1453 | /* | |
1454 | * Call has timed out so we kill the kconsumerd_thread and return | |
1455 | * an error. | |
1456 | */ | |
3bd1e081 MD |
1457 | ERR("The consumer thread was never ready. Killing it"); |
1458 | ret = pthread_cancel(consumer_data->thread); | |
ee0b0061 | 1459 | if (ret < 0) { |
3bd1e081 | 1460 | PERROR("pthread_cancel consumer thread"); |
ee0b0061 DG |
1461 | } |
1462 | } else { | |
3bd1e081 | 1463 | PERROR("semaphore wait failed consumer thread"); |
ee0b0061 DG |
1464 | } |
1465 | goto error; | |
1466 | } | |
1467 | ||
3bd1e081 MD |
1468 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1469 | if (consumer_data->pid == 0) { | |
712ea556 | 1470 | ERR("Kconsumerd did not start"); |
3bd1e081 | 1471 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 DG |
1472 | goto error; |
1473 | } | |
3bd1e081 | 1474 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
712ea556 | 1475 | |
8c0faa1d DG |
1476 | return 0; |
1477 | ||
1478 | error: | |
1479 | return ret; | |
1480 | } | |
1481 | ||
d9800920 | 1482 | /* |
3bd1e081 | 1483 | * Join consumer thread |
d9800920 | 1484 | */ |
3bd1e081 | 1485 | static int join_consumer_thread(struct consumer_data *consumer_data) |
cf3af59e MD |
1486 | { |
1487 | void *status; | |
1488 | int ret; | |
1489 | ||
3bd1e081 MD |
1490 | if (consumer_data->pid != 0) { |
1491 | ret = kill(consumer_data->pid, SIGTERM); | |
cf3af59e | 1492 | if (ret) { |
3bd1e081 | 1493 | ERR("Error killing consumer daemon"); |
cf3af59e MD |
1494 | return ret; |
1495 | } | |
3bd1e081 | 1496 | return pthread_join(consumer_data->thread, &status); |
cf3af59e MD |
1497 | } else { |
1498 | return 0; | |
1499 | } | |
1500 | } | |
1501 | ||
8c0faa1d | 1502 | /* |
3bd1e081 | 1503 | * Fork and exec a consumer daemon (consumerd). |
8c0faa1d | 1504 | * |
d063d709 | 1505 | * Return pid if successful else -1. |
8c0faa1d | 1506 | */ |
3bd1e081 | 1507 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
8c0faa1d DG |
1508 | { |
1509 | int ret; | |
1510 | pid_t pid; | |
94c55f17 | 1511 | const char *consumer_to_use; |
53086306 | 1512 | const char *verbosity; |
94c55f17 | 1513 | struct stat st; |
8c0faa1d | 1514 | |
3bd1e081 | 1515 | DBG("Spawning consumerd"); |
c49dc785 | 1516 | |
8c0faa1d DG |
1517 | pid = fork(); |
1518 | if (pid == 0) { | |
1519 | /* | |
3bd1e081 | 1520 | * Exec consumerd. |
8c0faa1d | 1521 | */ |
3bd1e081 | 1522 | if (opt_verbose > 1 || opt_verbose_consumer) { |
53086306 DG |
1523 | verbosity = "--verbose"; |
1524 | } else { | |
1525 | verbosity = "--quiet"; | |
1526 | } | |
3bd1e081 MD |
1527 | switch (consumer_data->type) { |
1528 | case LTTNG_CONSUMER_KERNEL: | |
94c55f17 | 1529 | /* |
f806231f MD |
1530 | * Find out which consumerd to execute. We will |
1531 | * first try the 64-bit path, then the | |
1532 | * sessiond's installation directory, and | |
1533 | * fallback on the 32-bit one, | |
94c55f17 AM |
1534 | */ |
1535 | if (stat(consumerd64_bin, &st) == 0) { | |
1536 | consumer_to_use = consumerd64_bin; | |
94c55f17 AM |
1537 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
1538 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; | |
eb1e0bd4 MD |
1539 | } else if (stat(consumerd32_bin, &st) == 0) { |
1540 | consumer_to_use = consumerd32_bin; | |
94c55f17 AM |
1541 | } else { |
1542 | break; | |
1543 | } | |
1544 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
1545 | execl(consumer_to_use, | |
1546 | "lttng-consumerd", verbosity, "-k", | |
1547 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
1548 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1549 | NULL); | |
3bd1e081 | 1550 | break; |
7753dea8 MD |
1551 | case LTTNG_CONSUMER64_UST: |
1552 | { | |
b1e0b6b6 | 1553 | char *tmpnew = NULL; |
8f4905da MD |
1554 | |
1555 | if (consumerd64_libdir[0] != '\0') { | |
1556 | char *tmp; | |
1557 | size_t tmplen; | |
1558 | ||
1559 | tmp = getenv("LD_LIBRARY_PATH"); | |
1560 | if (!tmp) { | |
1561 | tmp = ""; | |
1562 | } | |
1563 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1564 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); | |
1565 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1566 | if (!tmpnew) { | |
1567 | ret = -ENOMEM; | |
1568 | goto error; | |
1569 | } | |
1570 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1571 | strcat(tmpnew, consumerd64_libdir); | |
1572 | if (tmp[0] != '\0') { | |
1573 | strcat(tmpnew, ":"); | |
1574 | strcat(tmpnew, tmp); | |
1575 | } | |
1576 | ret = putenv(tmpnew); | |
1577 | if (ret) { | |
1578 | ret = -errno; | |
1579 | goto error; | |
1580 | } | |
1581 | } | |
94c55f17 | 1582 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
a5a6aff3 | 1583 | ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1584 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1585 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1586 | NULL); | |
8f4905da MD |
1587 | if (consumerd64_libdir[0] != '\0') { |
1588 | free(tmpnew); | |
1589 | } | |
1590 | if (ret) { | |
1591 | goto error; | |
1592 | } | |
3bd1e081 | 1593 | break; |
7753dea8 MD |
1594 | } |
1595 | case LTTNG_CONSUMER32_UST: | |
1596 | { | |
937dde8e | 1597 | char *tmpnew = NULL; |
8f4905da MD |
1598 | |
1599 | if (consumerd32_libdir[0] != '\0') { | |
1600 | char *tmp; | |
1601 | size_t tmplen; | |
1602 | ||
1603 | tmp = getenv("LD_LIBRARY_PATH"); | |
1604 | if (!tmp) { | |
1605 | tmp = ""; | |
1606 | } | |
1607 | tmplen = strlen("LD_LIBRARY_PATH=") | |
1608 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); | |
1609 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
1610 | if (!tmpnew) { | |
1611 | ret = -ENOMEM; | |
1612 | goto error; | |
1613 | } | |
1614 | strcpy(tmpnew, "LD_LIBRARY_PATH="); | |
1615 | strcat(tmpnew, consumerd32_libdir); | |
1616 | if (tmp[0] != '\0') { | |
1617 | strcat(tmpnew, ":"); | |
1618 | strcat(tmpnew, tmp); | |
1619 | } | |
1620 | ret = putenv(tmpnew); | |
1621 | if (ret) { | |
1622 | ret = -errno; | |
1623 | goto error; | |
1624 | } | |
1625 | } | |
94c55f17 | 1626 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
a5a6aff3 | 1627 | ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u", |
7753dea8 MD |
1628 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
1629 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
1630 | NULL); | |
8f4905da MD |
1631 | if (consumerd32_libdir[0] != '\0') { |
1632 | free(tmpnew); | |
1633 | } | |
1634 | if (ret) { | |
1635 | goto error; | |
1636 | } | |
7753dea8 MD |
1637 | break; |
1638 | } | |
3bd1e081 MD |
1639 | default: |
1640 | perror("unknown consumer type"); | |
1641 | exit(EXIT_FAILURE); | |
1642 | } | |
8c0faa1d DG |
1643 | if (errno != 0) { |
1644 | perror("kernel start consumer exec"); | |
1645 | } | |
1646 | exit(EXIT_FAILURE); | |
1647 | } else if (pid > 0) { | |
1648 | ret = pid; | |
8c0faa1d | 1649 | } else { |
3bd1e081 | 1650 | perror("start consumer fork"); |
8c0faa1d | 1651 | ret = -errno; |
8c0faa1d | 1652 | } |
8f4905da | 1653 | error: |
8c0faa1d DG |
1654 | return ret; |
1655 | } | |
1656 | ||
693bd40b | 1657 | /* |
3bd1e081 | 1658 | * Spawn the consumerd daemon and session daemon thread. |
693bd40b | 1659 | */ |
3bd1e081 | 1660 | static int start_consumerd(struct consumer_data *consumer_data) |
693bd40b DG |
1661 | { |
1662 | int ret; | |
1663 | ||
3bd1e081 MD |
1664 | pthread_mutex_lock(&consumer_data->pid_mutex); |
1665 | if (consumer_data->pid != 0) { | |
1666 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 DG |
1667 | goto end; |
1668 | } | |
693bd40b | 1669 | |
3bd1e081 | 1670 | ret = spawn_consumerd(consumer_data); |
c49dc785 | 1671 | if (ret < 0) { |
3bd1e081 MD |
1672 | ERR("Spawning consumerd failed"); |
1673 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
c49dc785 | 1674 | goto error; |
693bd40b | 1675 | } |
c49dc785 | 1676 | |
3bd1e081 MD |
1677 | /* Setting up the consumer_data pid */ |
1678 | consumer_data->pid = ret; | |
48842b30 | 1679 | DBG2("Consumer pid %d", consumer_data->pid); |
3bd1e081 | 1680 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
693bd40b | 1681 | |
3bd1e081 MD |
1682 | DBG2("Spawning consumer control thread"); |
1683 | ret = spawn_consumer_thread(consumer_data); | |
693bd40b | 1684 | if (ret < 0) { |
3bd1e081 | 1685 | ERR("Fatal error spawning consumer control thread"); |
693bd40b DG |
1686 | goto error; |
1687 | } | |
1688 | ||
c49dc785 | 1689 | end: |
693bd40b DG |
1690 | return 0; |
1691 | ||
1692 | error: | |
1693 | return ret; | |
1694 | } | |
1695 | ||
b73401da | 1696 | /* |
d063d709 | 1697 | * modprobe_kernel_modules |
b73401da DG |
1698 | */ |
1699 | static int modprobe_kernel_modules(void) | |
1700 | { | |
ab147185 | 1701 | int ret = 0, i; |
b73401da DG |
1702 | char modprobe[256]; |
1703 | ||
ab147185 MD |
1704 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1705 | ret = snprintf(modprobe, sizeof(modprobe), | |
1706 | "/sbin/modprobe %s%s", | |
24b487b8 | 1707 | kernel_modules_list[i].required ? "" : "-q ", |
ab147185 | 1708 | kernel_modules_list[i].name); |
b73401da DG |
1709 | if (ret < 0) { |
1710 | perror("snprintf modprobe"); | |
1711 | goto error; | |
1712 | } | |
ab147185 | 1713 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1714 | ret = system(modprobe); |
ab147185 MD |
1715 | if (ret == -1) { |
1716 | ERR("Unable to launch modprobe for module %s", | |
1717 | kernel_modules_list[i].name); | |
1718 | } else if (kernel_modules_list[i].required | |
d9800920 | 1719 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1720 | ERR("Unable to load module %s", |
1721 | kernel_modules_list[i].name); | |
1722 | } else { | |
1723 | DBG("Modprobe successfully %s", | |
1724 | kernel_modules_list[i].name); | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | error: | |
1729 | return ret; | |
1730 | } | |
1731 | ||
b73401da | 1732 | /* |
d063d709 | 1733 | * mount_debugfs |
b73401da DG |
1734 | */ |
1735 | static int mount_debugfs(char *path) | |
1736 | { | |
1737 | int ret; | |
1738 | char *type = "debugfs"; | |
1739 | ||
996b65c8 | 1740 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da | 1741 | if (ret < 0) { |
7272acf5 | 1742 | PERROR("Cannot create debugfs path"); |
b73401da DG |
1743 | goto error; |
1744 | } | |
1745 | ||
1746 | ret = mount(type, path, type, 0, NULL); | |
1747 | if (ret < 0) { | |
7272acf5 | 1748 | PERROR("Cannot mount debugfs"); |
b73401da DG |
1749 | goto error; |
1750 | } | |
1751 | ||
1752 | DBG("Mounted debugfs successfully at %s", path); | |
1753 | ||
1754 | error: | |
1755 | return ret; | |
1756 | } | |
1757 | ||
8c0faa1d | 1758 | /* |
d063d709 | 1759 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1760 | */ |
f3ed775e | 1761 | static void init_kernel_tracer(void) |
8c0faa1d | 1762 | { |
b73401da DG |
1763 | int ret; |
1764 | char *proc_mounts = "/proc/mounts"; | |
1765 | char line[256]; | |
684d34d2 | 1766 | char *debugfs_path = NULL, *lttng_path = NULL; |
b73401da DG |
1767 | FILE *fp; |
1768 | ||
1769 | /* Detect debugfs */ | |
1770 | fp = fopen(proc_mounts, "r"); | |
1771 | if (fp == NULL) { | |
1772 | ERR("Unable to probe %s", proc_mounts); | |
1773 | goto error; | |
1774 | } | |
1775 | ||
1776 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1777 | if (strstr(line, "debugfs") != NULL) { | |
1778 | /* Remove first string */ | |
1779 | strtok(line, " "); | |
1780 | /* Dup string here so we can reuse line later on */ | |
1781 | debugfs_path = strdup(strtok(NULL, " ")); | |
1782 | DBG("Got debugfs path : %s", debugfs_path); | |
1783 | break; | |
1784 | } | |
1785 | } | |
1786 | ||
1787 | fclose(fp); | |
1788 | ||
1789 | /* Mount debugfs if needded */ | |
1790 | if (debugfs_path == NULL) { | |
1791 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1792 | if (ret < 0) { | |
1793 | perror("asprintf debugfs path"); | |
1794 | goto error; | |
1795 | } | |
1796 | ret = mount_debugfs(debugfs_path); | |
1797 | if (ret < 0) { | |
7272acf5 | 1798 | perror("Cannot mount debugfs"); |
b73401da DG |
1799 | goto error; |
1800 | } | |
1801 | } | |
1802 | ||
1803 | /* Modprobe lttng kernel modules */ | |
1804 | ret = modprobe_kernel_modules(); | |
1805 | if (ret < 0) { | |
1806 | goto error; | |
1807 | } | |
1808 | ||
1809 | /* Setup lttng kernel path */ | |
1810 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1811 | if (ret < 0) { | |
1812 | perror("asprintf lttng path"); | |
1813 | goto error; | |
1814 | } | |
1815 | ||
1816 | /* Open debugfs lttng */ | |
1817 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1818 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1819 | DBG("Failed to open %s", lttng_path); |
1820 | goto error; | |
8c0faa1d DG |
1821 | } |
1822 | ||
b73401da DG |
1823 | free(lttng_path); |
1824 | free(debugfs_path); | |
f3ed775e | 1825 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1826 | return; |
1827 | ||
1828 | error: | |
1829 | if (lttng_path) { | |
1830 | free(lttng_path); | |
1831 | } | |
1832 | if (debugfs_path) { | |
1833 | free(debugfs_path); | |
1834 | } | |
1835 | WARN("No kernel tracer available"); | |
1836 | kernel_tracer_fd = 0; | |
1837 | return; | |
f3ed775e | 1838 | } |
33a2b854 | 1839 | |
f3ed775e | 1840 | /* |
54d01ffb | 1841 | * Init tracing by creating trace directory and sending fds kernel consumer. |
f3ed775e | 1842 | */ |
54d01ffb | 1843 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
f3ed775e | 1844 | { |
f40799e8 | 1845 | int ret = 0; |
8c0faa1d | 1846 | |
3bd1e081 | 1847 | if (session->consumer_fds_sent == 0) { |
d9800920 | 1848 | /* |
54d01ffb DG |
1849 | * Assign default kernel consumer socket if no consumer assigned to the |
1850 | * kernel session. At this point, it's NOT suppose to be 0 but this is | |
1851 | * an extra security check. | |
d9800920 DG |
1852 | */ |
1853 | if (session->consumer_fd == 0) { | |
3bd1e081 | 1854 | session->consumer_fd = kconsumer_data.cmd_sock; |
d9800920 DG |
1855 | } |
1856 | ||
2bdd86d4 | 1857 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
f3ed775e | 1858 | if (ret < 0) { |
f3ed775e DG |
1859 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
1860 | goto error; | |
1861 | } | |
1d4b027a | 1862 | |
3bd1e081 | 1863 | session->consumer_fds_sent = 1; |
f3ed775e | 1864 | } |
1d4b027a DG |
1865 | |
1866 | error: | |
1867 | return ret; | |
8c0faa1d DG |
1868 | } |
1869 | ||
0177d773 DG |
1870 | /* |
1871 | * Create an UST session and add it to the session ust list. | |
1872 | */ | |
44d3bd01 | 1873 | static int create_ust_session(struct ltt_session *session, |
be040666 | 1874 | struct lttng_domain *domain, struct ucred *creds) |
0177d773 | 1875 | { |
44d3bd01 | 1876 | int ret; |
be040666 DG |
1877 | unsigned int sess_uid; |
1878 | gid_t gid; | |
13384287 | 1879 | struct ltt_ust_session *lus = NULL; |
44d3bd01 DG |
1880 | |
1881 | switch (domain->type) { | |
48842b30 | 1882 | case LTTNG_DOMAIN_UST: |
44d3bd01 DG |
1883 | break; |
1884 | default: | |
13384287 | 1885 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
44d3bd01 DG |
1886 | goto error; |
1887 | } | |
0177d773 DG |
1888 | |
1889 | DBG("Creating UST session"); | |
1890 | ||
be040666 DG |
1891 | sess_uid = session->uid; |
1892 | lus = trace_ust_create_session(session->path, sess_uid, domain); | |
0177d773 | 1893 | if (lus == NULL) { |
44d3bd01 | 1894 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1895 | goto error; |
1896 | } | |
1897 | ||
be040666 DG |
1898 | /* |
1899 | * Get the right group ID. To use the tracing group, the daemon must be | |
1900 | * running with root credentials or else it's the user GID used. | |
1901 | */ | |
1902 | gid = allowed_group(); | |
1903 | if (gid < 0 || !is_root) { | |
1904 | gid = creds->gid; | |
1905 | } | |
1906 | ||
1907 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, creds->uid, gid); | |
0177d773 DG |
1908 | if (ret < 0) { |
1909 | if (ret != -EEXIST) { | |
1910 | ERR("Trace directory creation error"); | |
44d3bd01 | 1911 | ret = LTTCOMM_UST_SESS_FAIL; |
0177d773 DG |
1912 | goto error; |
1913 | } | |
1914 | } | |
1915 | ||
f6a9efaa DG |
1916 | /* The domain type dictate different actions on session creation */ |
1917 | switch (domain->type) { | |
48842b30 DG |
1918 | case LTTNG_DOMAIN_UST: |
1919 | /* No ustctl for the global UST domain */ | |
1920 | break; | |
1921 | default: | |
36dc12cc | 1922 | ERR("Unknown UST domain on create session %d", domain->type); |
48842b30 | 1923 | goto error; |
0177d773 | 1924 | } |
f6a9efaa | 1925 | session->ust_session = lus; |
44d3bd01 DG |
1926 | |
1927 | return LTTCOMM_OK; | |
0177d773 DG |
1928 | |
1929 | error: | |
1930 | free(lus); | |
1931 | return ret; | |
1932 | } | |
1933 | ||
333f285e | 1934 | /* |
d063d709 | 1935 | * Create a kernel tracer session then create the default channel. |
333f285e | 1936 | */ |
be040666 DG |
1937 | static int create_kernel_session(struct ltt_session *session, |
1938 | struct ucred *creds) | |
333f285e | 1939 | { |
f3ed775e | 1940 | int ret; |
be040666 | 1941 | gid_t gid; |
f3ed775e DG |
1942 | |
1943 | DBG("Creating kernel session"); | |
1944 | ||
1945 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1946 | if (ret < 0) { | |
1947 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1948 | goto error; | |
333f285e DG |
1949 | } |
1950 | ||
d9800920 | 1951 | /* Set kernel consumer socket fd */ |
3bd1e081 MD |
1952 | if (kconsumer_data.cmd_sock) { |
1953 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; | |
d9800920 DG |
1954 | } |
1955 | ||
be040666 DG |
1956 | gid = allowed_group(); |
1957 | if (gid < 0) { | |
1958 | /* | |
1959 | * Use GID 0 has a fallback since kernel session is only allowed under | |
1960 | * root or the gid of the calling user | |
1961 | */ | |
1962 | is_root ? (gid = 0) : (gid = creds->gid); | |
1963 | } | |
1964 | ||
63053e7c | 1965 | ret = mkdir_recursive(session->kernel_session->trace_path, |
be040666 | 1966 | S_IRWXU | S_IRWXG, creds->uid, gid); |
7a485870 | 1967 | if (ret < 0) { |
996b65c8 | 1968 | if (ret != -EEXIST) { |
7a485870 DG |
1969 | ERR("Trace directory creation error"); |
1970 | goto error; | |
1971 | } | |
1972 | } | |
1973 | ||
f3ed775e DG |
1974 | error: |
1975 | return ret; | |
333f285e DG |
1976 | } |
1977 | ||
6c9cc2ab DG |
1978 | /* |
1979 | * Using the session list, filled a lttng_session array to send back to the | |
1980 | * client for session listing. | |
1981 | * | |
1982 | * The session list lock MUST be acquired before calling this function. Use | |
54d01ffb | 1983 | * session_lock_list() and session_unlock_list(). |
6c9cc2ab DG |
1984 | */ |
1985 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1986 | { | |
1987 | int i = 0; | |
1988 | struct ltt_session *session; | |
1989 | ||
1990 | DBG("Getting all available session"); | |
1991 | /* | |
1992 | * Iterate over session list and append data after the control struct in | |
1993 | * the buffer. | |
1994 | */ | |
1995 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1996 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1997 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1998 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1999 | sessions[i].name[NAME_MAX - 1] = '\0'; |
464dd62d | 2000 | sessions[i].enabled = session->enabled; |
6c9cc2ab DG |
2001 | i++; |
2002 | } | |
2003 | } | |
2004 | ||
9f19cc17 DG |
2005 | /* |
2006 | * Fill lttng_channel array of all channels. | |
2007 | */ | |
b551a063 | 2008 | static void list_lttng_channels(int domain, struct ltt_session *session, |
9f19cc17 DG |
2009 | struct lttng_channel *channels) |
2010 | { | |
2011 | int i = 0; | |
2012 | struct ltt_kernel_channel *kchan; | |
2013 | ||
2014 | DBG("Listing channels for session %s", session->name); | |
2015 | ||
b551a063 DG |
2016 | switch (domain) { |
2017 | case LTTNG_DOMAIN_KERNEL: | |
2018 | /* Kernel channels */ | |
2019 | if (session->kernel_session != NULL) { | |
2020 | cds_list_for_each_entry(kchan, | |
2021 | &session->kernel_session->channel_list.head, list) { | |
2022 | /* Copy lttng_channel struct to array */ | |
2023 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
2024 | channels[i].enabled = kchan->enabled; | |
2025 | i++; | |
2026 | } | |
2027 | } | |
2028 | break; | |
2029 | case LTTNG_DOMAIN_UST: | |
2030 | { | |
2031 | struct cds_lfht_iter iter; | |
2032 | struct ltt_ust_channel *uchan; | |
2033 | ||
2034 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, | |
2035 | &iter, uchan, node) { | |
2036 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); | |
2037 | channels[i].attr.overwrite = uchan->attr.overwrite; | |
2038 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; | |
2039 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; | |
2040 | channels[i].attr.switch_timer_interval = | |
2041 | uchan->attr.switch_timer_interval; | |
2042 | channels[i].attr.read_timer_interval = | |
2043 | uchan->attr.read_timer_interval; | |
aea829b3 | 2044 | channels[i].enabled = uchan->enabled; |
5edd7e09 DG |
2045 | switch (uchan->attr.output) { |
2046 | case LTTNG_UST_MMAP: | |
2047 | default: | |
2048 | channels[i].attr.output = LTTNG_EVENT_MMAP; | |
2049 | break; | |
2050 | } | |
befe0905 | 2051 | i++; |
b551a063 DG |
2052 | } |
2053 | break; | |
2054 | } | |
2055 | default: | |
2056 | break; | |
2057 | } | |
2058 | } | |
2059 | ||
2060 | /* | |
2061 | * Create a list of ust global domain events. | |
2062 | */ | |
2063 | static int list_lttng_ust_global_events(char *channel_name, | |
2064 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) | |
2065 | { | |
2066 | int i = 0, ret = 0; | |
2067 | unsigned int nb_event = 0; | |
2068 | struct cds_lfht_iter iter; | |
d7b75b30 | 2069 | struct cds_lfht_node *node; |
b551a063 DG |
2070 | struct ltt_ust_channel *uchan; |
2071 | struct ltt_ust_event *uevent; | |
2072 | struct lttng_event *tmp; | |
2073 | ||
2074 | DBG("Listing UST global events for channel %s", channel_name); | |
2075 | ||
2076 | rcu_read_lock(); | |
2077 | ||
d7b75b30 DG |
2078 | node = hashtable_lookup(ust_global->channels, (void *) channel_name, |
2079 | strlen(channel_name), &iter); | |
2080 | if (node == NULL) { | |
2081 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; | |
2082 | goto error; | |
b551a063 DG |
2083 | } |
2084 | ||
d7b75b30 DG |
2085 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
2086 | ||
2087 | nb_event += hashtable_get_count(uchan->events); | |
2088 | ||
b551a063 DG |
2089 | if (nb_event == 0) { |
2090 | ret = nb_event; | |
2091 | goto error; | |
2092 | } | |
2093 | ||
2094 | DBG3("Listing UST global %d events", nb_event); | |
2095 | ||
2096 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2097 | if (tmp == NULL) { | |
2098 | ret = -LTTCOMM_FATAL; | |
2099 | goto error; | |
2100 | } | |
2101 | ||
d7b75b30 DG |
2102 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
2103 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); | |
2104 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2105 | tmp[i].enabled = uevent->enabled; | |
2106 | switch (uevent->attr.instrumentation) { | |
2107 | case LTTNG_UST_TRACEPOINT: | |
2108 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; | |
2109 | break; | |
2110 | case LTTNG_UST_PROBE: | |
2111 | tmp[i].type = LTTNG_EVENT_PROBE; | |
2112 | break; | |
2113 | case LTTNG_UST_FUNCTION: | |
2114 | tmp[i].type = LTTNG_EVENT_FUNCTION; | |
2115 | break; | |
ac3bd9c0 | 2116 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
e4baff1e | 2117 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
ac3bd9c0 | 2118 | break; |
9f19cc17 | 2119 | } |
d7b75b30 | 2120 | i++; |
9f19cc17 DG |
2121 | } |
2122 | ||
b551a063 DG |
2123 | ret = nb_event; |
2124 | *events = tmp; | |
2125 | ||
2126 | error: | |
2127 | rcu_read_unlock(); | |
2128 | return ret; | |
9f19cc17 DG |
2129 | } |
2130 | ||
2131 | /* | |
b551a063 | 2132 | * Fill lttng_event array of all kernel events in the channel. |
9f19cc17 | 2133 | */ |
b551a063 DG |
2134 | static int list_lttng_kernel_events(char *channel_name, |
2135 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) | |
9f19cc17 | 2136 | { |
b551a063 DG |
2137 | int i = 0, ret; |
2138 | unsigned int nb_event; | |
9f19cc17 | 2139 | struct ltt_kernel_event *event; |
b551a063 DG |
2140 | struct ltt_kernel_channel *kchan; |
2141 | ||
2142 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); | |
2143 | if (kchan == NULL) { | |
2144 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2145 | goto error; | |
2146 | } | |
2147 | ||
2148 | nb_event = kchan->event_count; | |
9f19cc17 DG |
2149 | |
2150 | DBG("Listing events for channel %s", kchan->channel->name); | |
2151 | ||
b551a063 DG |
2152 | if (nb_event == 0) { |
2153 | ret = nb_event; | |
2154 | goto error; | |
2155 | } | |
2156 | ||
2157 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); | |
2158 | if (*events == NULL) { | |
2159 | ret = LTTCOMM_FATAL; | |
2160 | goto error; | |
2161 | } | |
2162 | ||
9f19cc17 DG |
2163 | /* Kernel channels */ |
2164 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
b551a063 DG |
2165 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
2166 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; | |
2167 | (*events)[i].enabled = event->enabled; | |
9f19cc17 DG |
2168 | switch (event->event->instrumentation) { |
2169 | case LTTNG_KERNEL_TRACEPOINT: | |
b551a063 | 2170 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
9f19cc17 DG |
2171 | break; |
2172 | case LTTNG_KERNEL_KPROBE: | |
2173 | case LTTNG_KERNEL_KRETPROBE: | |
b551a063 DG |
2174 | (*events)[i].type = LTTNG_EVENT_PROBE; |
2175 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, | |
9f19cc17 DG |
2176 | sizeof(struct lttng_kernel_kprobe)); |
2177 | break; | |
2178 | case LTTNG_KERNEL_FUNCTION: | |
b551a063 DG |
2179 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
2180 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, | |
9f19cc17 DG |
2181 | sizeof(struct lttng_kernel_function)); |
2182 | break; | |
0133c199 | 2183 | case LTTNG_KERNEL_NOOP: |
b551a063 | 2184 | (*events)[i].type = LTTNG_EVENT_NOOP; |
0133c199 | 2185 | break; |
a54bd42d | 2186 | case LTTNG_KERNEL_SYSCALL: |
b551a063 | 2187 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
0133c199 | 2188 | break; |
7a3d1328 MD |
2189 | case LTTNG_KERNEL_ALL: |
2190 | assert(0); | |
2191 | break; | |
9f19cc17 DG |
2192 | } |
2193 | i++; | |
2194 | } | |
b551a063 DG |
2195 | |
2196 | return nb_event; | |
2197 | ||
2198 | error: | |
2199 | return ret; | |
9f19cc17 DG |
2200 | } |
2201 | ||
fac6795d | 2202 | /* |
54d01ffb | 2203 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
fac6795d | 2204 | */ |
54d01ffb DG |
2205 | static int cmd_disable_channel(struct ltt_session *session, |
2206 | int domain, char *channel_name) | |
fac6795d | 2207 | { |
54d01ffb | 2208 | int ret; |
78f0bacd DG |
2209 | struct ltt_ust_session *usess; |
2210 | ||
2211 | usess = session->ust_session; | |
379473d2 | 2212 | |
54d01ffb | 2213 | switch (domain) { |
78f0bacd DG |
2214 | case LTTNG_DOMAIN_KERNEL: |
2215 | { | |
2216 | ret = channel_kernel_disable(session->kernel_session, | |
2217 | channel_name); | |
2218 | if (ret != LTTCOMM_OK) { | |
2219 | goto error; | |
2220 | } | |
54d01ffb | 2221 | |
78f0bacd DG |
2222 | kernel_wait_quiescent(kernel_tracer_fd); |
2223 | break; | |
2224 | } | |
2225 | case LTTNG_DOMAIN_UST: | |
2226 | { | |
2227 | struct ltt_ust_channel *uchan; | |
7885e399 | 2228 | struct cds_lfht *chan_ht; |
78f0bacd | 2229 | |
7885e399 DG |
2230 | chan_ht = usess->domain_global.channels; |
2231 | ||
2232 | uchan = trace_ust_find_channel_by_name(chan_ht, channel_name); | |
78f0bacd DG |
2233 | if (uchan == NULL) { |
2234 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
54d01ffb | 2235 | goto error; |
78f0bacd DG |
2236 | } |
2237 | ||
7885e399 DG |
2238 | ret = channel_ust_disable(usess, domain, uchan); |
2239 | if (ret != LTTCOMM_OK) { | |
78f0bacd DG |
2240 | goto error; |
2241 | } | |
78f0bacd DG |
2242 | break; |
2243 | } | |
2244 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
2245 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2246 | case LTTNG_DOMAIN_UST_PID: | |
2247 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2248 | goto error; | |
2249 | default: | |
2250 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2251 | goto error; | |
20fe2104 DG |
2252 | } |
2253 | ||
54d01ffb | 2254 | ret = LTTCOMM_OK; |
d65106b1 | 2255 | |
54d01ffb DG |
2256 | error: |
2257 | return ret; | |
2258 | } | |
2259 | ||
2260 | /* | |
2261 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. | |
2262 | */ | |
44d3bd01 | 2263 | static int cmd_enable_channel(struct ltt_session *session, |
aea829b3 | 2264 | int domain, struct lttng_channel *attr) |
54d01ffb DG |
2265 | { |
2266 | int ret; | |
f6a9efaa | 2267 | struct ltt_ust_session *usess = session->ust_session; |
7885e399 | 2268 | struct cds_lfht *chan_ht; |
f6a9efaa | 2269 | |
5d56b5aa | 2270 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
d65106b1 | 2271 | |
aea829b3 | 2272 | switch (domain) { |
44d3bd01 DG |
2273 | case LTTNG_DOMAIN_KERNEL: |
2274 | { | |
2275 | struct ltt_kernel_channel *kchan; | |
54d01ffb | 2276 | |
44d3bd01 DG |
2277 | kchan = trace_kernel_get_channel_by_name(attr->name, |
2278 | session->kernel_session); | |
2279 | if (kchan == NULL) { | |
2280 | ret = channel_kernel_create(session->kernel_session, | |
2281 | attr, kernel_poll_pipe[1]); | |
2282 | } else { | |
2283 | ret = channel_kernel_enable(session->kernel_session, kchan); | |
2284 | } | |
2285 | ||
2286 | if (ret != LTTCOMM_OK) { | |
2287 | goto error; | |
2288 | } | |
2289 | ||
2290 | kernel_wait_quiescent(kernel_tracer_fd); | |
2291 | break; | |
2292 | } | |
f6a9efaa DG |
2293 | case LTTNG_DOMAIN_UST: |
2294 | { | |
2295 | struct ltt_ust_channel *uchan; | |
2296 | ||
7885e399 | 2297 | chan_ht = usess->domain_global.channels; |
f6a9efaa | 2298 | |
7885e399 | 2299 | uchan = trace_ust_find_channel_by_name(chan_ht, attr->name); |
f6a9efaa | 2300 | if (uchan == NULL) { |
7885e399 | 2301 | ret = channel_ust_create(usess, domain, attr); |
f6a9efaa | 2302 | } else { |
7885e399 | 2303 | ret = channel_ust_enable(usess, domain, uchan); |
48842b30 | 2304 | } |
f6a9efaa DG |
2305 | break; |
2306 | } | |
78f0bacd DG |
2307 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
2308 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
44d3bd01 | 2309 | case LTTNG_DOMAIN_UST_PID: |
f6a9efaa DG |
2310 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2311 | goto error; | |
44d3bd01 DG |
2312 | default: |
2313 | ret = LTTCOMM_UNKNOWN_DOMAIN; | |
2314 | goto error; | |
54d01ffb DG |
2315 | } |
2316 | ||
54d01ffb DG |
2317 | error: |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | /* | |
2322 | * Command LTTNG_DISABLE_EVENT processed by the client thread. | |
2323 | */ | |
2324 | static int cmd_disable_event(struct ltt_session *session, int domain, | |
2325 | char *channel_name, char *event_name) | |
2326 | { | |
2327 | int ret; | |
54d01ffb DG |
2328 | |
2329 | switch (domain) { | |
2330 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2331 | { |
2332 | struct ltt_kernel_channel *kchan; | |
b0a40d28 | 2333 | struct ltt_kernel_session *ksess; |
2bdd86d4 | 2334 | |
b0a40d28 DG |
2335 | ksess = session->kernel_session; |
2336 | ||
2337 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2338 | if (kchan == NULL) { |
2339 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2340 | goto error; | |
d65106b1 DG |
2341 | } |
2342 | ||
b0a40d28 | 2343 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
54d01ffb DG |
2344 | if (ret != LTTCOMM_OK) { |
2345 | goto error; | |
2346 | } | |
2347 | ||
2348 | kernel_wait_quiescent(kernel_tracer_fd); | |
d65106b1 | 2349 | break; |
2bdd86d4 MD |
2350 | } |
2351 | case LTTNG_DOMAIN_UST: | |
b0a40d28 | 2352 | { |
b0a40d28 | 2353 | struct ltt_ust_channel *uchan; |
7f79d3a1 | 2354 | struct ltt_ust_session *usess; |
b0a40d28 DG |
2355 | |
2356 | usess = session->ust_session; | |
2357 | ||
2358 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2359 | channel_name); | |
2360 | if (uchan == NULL) { | |
2361 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2362 | goto error; | |
2363 | } | |
2364 | ||
7f79d3a1 DG |
2365 | ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name); |
2366 | if (ret != LTTCOMM_OK) { | |
b0a40d28 DG |
2367 | goto error; |
2368 | } | |
2369 | ||
7f79d3a1 | 2370 | DBG3("Disable UST event %s in channel %s completed", event_name, |
b0a40d28 | 2371 | channel_name); |
b0a40d28 DG |
2372 | break; |
2373 | } | |
2bdd86d4 MD |
2374 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2375 | case LTTNG_DOMAIN_UST_PID: | |
2376 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2377 | default: |
54d01ffb DG |
2378 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2379 | goto error; | |
d65106b1 | 2380 | } |
26cc6b4e | 2381 | |
54d01ffb DG |
2382 | ret = LTTCOMM_OK; |
2383 | ||
2384 | error: | |
2385 | return ret; | |
2386 | } | |
2387 | ||
2388 | /* | |
2389 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. | |
2390 | */ | |
2391 | static int cmd_disable_event_all(struct ltt_session *session, int domain, | |
2392 | char *channel_name) | |
2393 | { | |
2394 | int ret; | |
54d01ffb DG |
2395 | |
2396 | switch (domain) { | |
2397 | case LTTNG_DOMAIN_KERNEL: | |
9730260e DG |
2398 | { |
2399 | struct ltt_kernel_session *ksess; | |
2400 | struct ltt_kernel_channel *kchan; | |
2401 | ||
2402 | ksess = session->kernel_session; | |
2403 | ||
2404 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); | |
54d01ffb DG |
2405 | if (kchan == NULL) { |
2406 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2407 | goto error; | |
26cc6b4e DG |
2408 | } |
2409 | ||
9730260e | 2410 | ret = event_kernel_disable_all(ksess, kchan); |
54d01ffb | 2411 | if (ret != LTTCOMM_OK) { |
0b97ec54 | 2412 | goto error; |
26cc6b4e DG |
2413 | } |
2414 | ||
54d01ffb | 2415 | kernel_wait_quiescent(kernel_tracer_fd); |
26cc6b4e | 2416 | break; |
9730260e DG |
2417 | } |
2418 | case LTTNG_DOMAIN_UST: | |
2419 | { | |
2420 | struct ltt_ust_session *usess; | |
2421 | struct ltt_ust_channel *uchan; | |
2422 | ||
2423 | usess = session->ust_session; | |
2424 | ||
2425 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2426 | channel_name); | |
2427 | if (uchan == NULL) { | |
2428 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; | |
2429 | goto error; | |
2430 | } | |
2431 | ||
7f79d3a1 DG |
2432 | ret = event_ust_disable_all_tracepoints(usess, domain, uchan); |
2433 | if (ret != 0) { | |
9730260e DG |
2434 | goto error; |
2435 | } | |
2436 | ||
7f79d3a1 | 2437 | DBG3("Disable all UST events in channel %s completed", channel_name); |
9730260e DG |
2438 | |
2439 | break; | |
2440 | } | |
2441 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2442 | case LTTNG_DOMAIN_UST_PID: | |
2443 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2444 | default: |
54d01ffb DG |
2445 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2446 | goto error; | |
26cc6b4e | 2447 | } |
e953ef25 | 2448 | |
54d01ffb | 2449 | ret = LTTCOMM_OK; |
e953ef25 | 2450 | |
54d01ffb DG |
2451 | error: |
2452 | return ret; | |
2453 | } | |
f5177a38 | 2454 | |
54d01ffb DG |
2455 | /* |
2456 | * Command LTTNG_ADD_CONTEXT processed by the client thread. | |
2457 | */ | |
2458 | static int cmd_add_context(struct ltt_session *session, int domain, | |
2459 | char *channel_name, char *event_name, struct lttng_event_context *ctx) | |
2460 | { | |
2461 | int ret; | |
f5177a38 | 2462 | |
54d01ffb DG |
2463 | switch (domain) { |
2464 | case LTTNG_DOMAIN_KERNEL: | |
2465 | /* Add kernel context to kernel tracer */ | |
2466 | ret = context_kernel_add(session->kernel_session, ctx, | |
2467 | event_name, channel_name); | |
2468 | if (ret != LTTCOMM_OK) { | |
f5177a38 | 2469 | goto error; |
e953ef25 | 2470 | } |
2bdd86d4 MD |
2471 | break; |
2472 | case LTTNG_DOMAIN_UST: | |
2473 | { | |
55cc08a6 | 2474 | struct ltt_ust_session *usess = session->ust_session; |
e953ef25 | 2475 | |
55cc08a6 DG |
2476 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
2477 | if (ret != LTTCOMM_OK) { | |
2478 | goto error; | |
2bdd86d4 | 2479 | } |
e953ef25 | 2480 | break; |
2bdd86d4 | 2481 | } |
55cc08a6 DG |
2482 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
2483 | case LTTNG_DOMAIN_UST_PID: | |
2484 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2485 | default: |
54d01ffb DG |
2486 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2487 | goto error; | |
e953ef25 | 2488 | } |
950131af | 2489 | |
54d01ffb | 2490 | ret = LTTCOMM_OK; |
950131af | 2491 | |
54d01ffb DG |
2492 | error: |
2493 | return ret; | |
2494 | } | |
2495 | ||
2496 | /* | |
2497 | * Command LTTNG_ENABLE_EVENT processed by the client thread. | |
13dce3b7 MD |
2498 | * |
2499 | * TODO: currently, both events and loglevels are kept within the same | |
2500 | * namespace for UST global registry/app registery, so if an event | |
2501 | * happen to have the same name as the loglevel (very unlikely though), | |
2502 | * and an attempt is made to enable/disable both in the same session, | |
2503 | * the first to be created will be the only one allowed to exist. | |
54d01ffb DG |
2504 | */ |
2505 | static int cmd_enable_event(struct ltt_session *session, int domain, | |
2506 | char *channel_name, struct lttng_event *event) | |
2507 | { | |
2508 | int ret; | |
f6cd6b0f | 2509 | struct lttng_channel *attr; |
48842b30 | 2510 | struct ltt_ust_session *usess = session->ust_session; |
54d01ffb DG |
2511 | |
2512 | switch (domain) { | |
2513 | case LTTNG_DOMAIN_KERNEL: | |
2bdd86d4 MD |
2514 | { |
2515 | struct ltt_kernel_channel *kchan; | |
2516 | ||
54d01ffb DG |
2517 | kchan = trace_kernel_get_channel_by_name(channel_name, |
2518 | session->kernel_session); | |
2519 | if (kchan == NULL) { | |
f6cd6b0f DG |
2520 | attr = channel_new_default_attr(domain); |
2521 | if (attr == NULL) { | |
2522 | ret = LTTCOMM_FATAL; | |
2523 | goto error; | |
2524 | } | |
2525 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2526 | ||
54d01ffb | 2527 | /* This call will notify the kernel thread */ |
44d3bd01 | 2528 | ret = channel_kernel_create(session->kernel_session, |
f6cd6b0f | 2529 | attr, kernel_poll_pipe[1]); |
54d01ffb | 2530 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2531 | free(attr); |
f5177a38 DG |
2532 | goto error; |
2533 | } | |
ff4d74e6 | 2534 | free(attr); |
54d01ffb | 2535 | } |
950131af | 2536 | |
54d01ffb DG |
2537 | /* Get the newly created kernel channel pointer */ |
2538 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2539 | session->kernel_session); | |
2540 | if (kchan == NULL) { | |
2541 | /* This sould not happen... */ | |
2542 | ret = LTTCOMM_FATAL; | |
2543 | goto error; | |
2544 | } | |
f5177a38 | 2545 | |
48842b30 DG |
2546 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
2547 | event); | |
54d01ffb | 2548 | if (ret != LTTCOMM_OK) { |
f5177a38 | 2549 | goto error; |
950131af DG |
2550 | } |
2551 | ||
54d01ffb | 2552 | kernel_wait_quiescent(kernel_tracer_fd); |
950131af | 2553 | break; |
2bdd86d4 MD |
2554 | } |
2555 | case LTTNG_DOMAIN_UST: | |
2556 | { | |
aea829b3 | 2557 | struct lttng_channel *attr; |
edb67388 | 2558 | struct ltt_ust_channel *uchan; |
2bdd86d4 | 2559 | |
edb67388 | 2560 | /* Get channel from global UST domain */ |
48842b30 DG |
2561 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
2562 | channel_name); | |
2563 | if (uchan == NULL) { | |
aea829b3 DG |
2564 | /* Create default channel */ |
2565 | attr = channel_new_default_attr(domain); | |
2566 | if (attr == NULL) { | |
2567 | ret = LTTCOMM_FATAL; | |
2568 | goto error; | |
2569 | } | |
596219f7 | 2570 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
edb67388 | 2571 | attr->name[NAME_MAX - 1] = '\0'; |
aea829b3 | 2572 | |
7885e399 | 2573 | ret = channel_ust_create(usess, domain, attr); |
edb67388 | 2574 | if (ret != LTTCOMM_OK) { |
ff4d74e6 | 2575 | free(attr); |
aea829b3 DG |
2576 | goto error; |
2577 | } | |
aea829b3 DG |
2578 | free(attr); |
2579 | ||
2580 | /* Get the newly created channel reference back */ | |
2581 | uchan = trace_ust_find_channel_by_name( | |
2582 | usess->domain_global.channels, channel_name); | |
2583 | if (uchan == NULL) { | |
2584 | /* Something is really wrong */ | |
2585 | ret = LTTCOMM_FATAL; | |
2586 | goto error; | |
2587 | } | |
48842b30 | 2588 | } |
2bdd86d4 | 2589 | |
edb67388 | 2590 | /* At this point, the session and channel exist on the tracer */ |
d5cd1f34 | 2591 | |
edb67388 DG |
2592 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
2593 | if (ret != LTTCOMM_OK) { | |
48842b30 | 2594 | goto error; |
2bdd86d4 MD |
2595 | } |
2596 | break; | |
2597 | } | |
2598 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2599 | case LTTNG_DOMAIN_UST_PID: | |
2600 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2601 | default: |
54d01ffb DG |
2602 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2603 | goto error; | |
950131af | 2604 | } |
d36b8583 | 2605 | |
54d01ffb | 2606 | ret = LTTCOMM_OK; |
d36b8583 | 2607 | |
54d01ffb DG |
2608 | error: |
2609 | return ret; | |
2610 | } | |
7d29a247 | 2611 | |
54d01ffb DG |
2612 | /* |
2613 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. | |
2614 | */ | |
2615 | static int cmd_enable_event_all(struct ltt_session *session, int domain, | |
8c9ae521 | 2616 | char *channel_name, int event_type) |
54d01ffb DG |
2617 | { |
2618 | int ret; | |
2619 | struct ltt_kernel_channel *kchan; | |
7d29a247 | 2620 | |
54d01ffb DG |
2621 | switch (domain) { |
2622 | case LTTNG_DOMAIN_KERNEL: | |
2623 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2624 | session->kernel_session); | |
2625 | if (kchan == NULL) { | |
2626 | /* This call will notify the kernel thread */ | |
44d3bd01 DG |
2627 | ret = channel_kernel_create(session->kernel_session, NULL, |
2628 | kernel_poll_pipe[1]); | |
54d01ffb DG |
2629 | if (ret != LTTCOMM_OK) { |
2630 | goto error; | |
d36b8583 | 2631 | } |
0d0c377a | 2632 | |
8f69e5eb DG |
2633 | /* Get the newly created kernel channel pointer */ |
2634 | kchan = trace_kernel_get_channel_by_name(channel_name, | |
2635 | session->kernel_session); | |
2636 | if (kchan == NULL) { | |
2637 | /* This sould not happen... */ | |
2638 | ret = LTTCOMM_FATAL; | |
2639 | goto error; | |
2640 | } | |
2641 | ||
54d01ffb | 2642 | } |
0fdd1e2c | 2643 | |
7a3d1328 | 2644 | switch (event_type) { |
76d45b40 | 2645 | case LTTNG_EVENT_SYSCALL: |
7a3d1328 | 2646 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
8c9ae521 | 2647 | kchan, kernel_tracer_fd); |
7a3d1328 | 2648 | break; |
76d45b40 | 2649 | case LTTNG_EVENT_TRACEPOINT: |
8c9ae521 | 2650 | /* |
7a3d1328 MD |
2651 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
2652 | * events already registered to the channel. | |
8c9ae521 | 2653 | */ |
7a3d1328 MD |
2654 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
2655 | kchan, kernel_tracer_fd); | |
2656 | break; | |
76d45b40 | 2657 | case LTTNG_EVENT_ALL: |
7a3d1328 | 2658 | /* Enable syscalls and tracepoints */ |
8c9ae521 DG |
2659 | ret = event_kernel_enable_all(session->kernel_session, |
2660 | kchan, kernel_tracer_fd); | |
7a3d1328 MD |
2661 | break; |
2662 | default: | |
2663 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2664 | goto error; | |
8c9ae521 | 2665 | } |
8f69e5eb DG |
2666 | |
2667 | /* Manage return value */ | |
54d01ffb | 2668 | if (ret != LTTCOMM_OK) { |
0d0c377a | 2669 | goto error; |
d36b8583 DG |
2670 | } |
2671 | ||
54d01ffb | 2672 | kernel_wait_quiescent(kernel_tracer_fd); |
d36b8583 | 2673 | break; |
76d45b40 DG |
2674 | case LTTNG_DOMAIN_UST: |
2675 | { | |
2676 | struct lttng_channel *attr; | |
2677 | struct ltt_ust_channel *uchan; | |
2678 | struct ltt_ust_session *usess = session->ust_session; | |
2679 | ||
2680 | /* Get channel from global UST domain */ | |
2681 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
2682 | channel_name); | |
2683 | if (uchan == NULL) { | |
2684 | /* Create default channel */ | |
2685 | attr = channel_new_default_attr(domain); | |
2686 | if (attr == NULL) { | |
2687 | ret = LTTCOMM_FATAL; | |
2688 | goto error; | |
2689 | } | |
2690 | snprintf(attr->name, NAME_MAX, "%s", channel_name); | |
2691 | attr->name[NAME_MAX - 1] = '\0'; | |
2692 | ||
2693 | /* Use the internal command enable channel */ | |
7885e399 | 2694 | ret = channel_ust_create(usess, domain, attr); |
76d45b40 DG |
2695 | if (ret != LTTCOMM_OK) { |
2696 | free(attr); | |
2697 | goto error; | |
2698 | } | |
2699 | free(attr); | |
2700 | ||
2701 | /* Get the newly created channel reference back */ | |
2702 | uchan = trace_ust_find_channel_by_name( | |
2703 | usess->domain_global.channels, channel_name); | |
2704 | if (uchan == NULL) { | |
2705 | /* Something is really wrong */ | |
2706 | ret = LTTCOMM_FATAL; | |
2707 | goto error; | |
2708 | } | |
2709 | } | |
2710 | ||
2711 | /* At this point, the session and channel exist on the tracer */ | |
2712 | ||
2713 | switch (event_type) { | |
2714 | case LTTNG_EVENT_ALL: | |
2715 | case LTTNG_EVENT_TRACEPOINT: | |
2716 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); | |
2717 | if (ret != LTTCOMM_OK) { | |
2718 | goto error; | |
2719 | } | |
2720 | break; | |
2721 | default: | |
2722 | ret = LTTCOMM_UST_ENABLE_FAIL; | |
2723 | goto error; | |
2724 | } | |
2725 | ||
2726 | /* Manage return value */ | |
2727 | if (ret != LTTCOMM_OK) { | |
2728 | goto error; | |
2729 | } | |
2730 | ||
2731 | break; | |
2732 | } | |
2733 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
2734 | case LTTNG_DOMAIN_UST_PID: | |
2735 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
54d01ffb | 2736 | default: |
54d01ffb DG |
2737 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2738 | goto error; | |
d36b8583 | 2739 | } |
f3ed775e | 2740 | |
54d01ffb DG |
2741 | ret = LTTCOMM_OK; |
2742 | ||
2743 | error: | |
2744 | return ret; | |
2745 | } | |
2746 | ||
2747 | /* | |
2748 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. | |
2749 | */ | |
2750 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) | |
2751 | { | |
2752 | int ret; | |
2753 | ssize_t nb_events = 0; | |
2754 | ||
2755 | switch (domain) { | |
2756 | case LTTNG_DOMAIN_KERNEL: | |
2757 | nb_events = kernel_list_events(kernel_tracer_fd, events); | |
2758 | if (nb_events < 0) { | |
2759 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2760 | goto error; | |
894be886 | 2761 | } |
54d01ffb | 2762 | break; |
b551a063 DG |
2763 | case LTTNG_DOMAIN_UST: |
2764 | nb_events = ust_app_list_events(events); | |
2765 | if (nb_events < 0) { | |
2766 | ret = LTTCOMM_UST_LIST_FAIL; | |
2767 | goto error; | |
2768 | } | |
2769 | break; | |
54d01ffb | 2770 | default: |
54d01ffb DG |
2771 | ret = LTTCOMM_NOT_IMPLEMENTED; |
2772 | goto error; | |
2773 | } | |
894be886 | 2774 | |
54d01ffb | 2775 | return nb_events; |
7d29a247 | 2776 | |
54d01ffb DG |
2777 | error: |
2778 | /* Return negative value to differentiate return code */ | |
2779 | return -ret; | |
2780 | } | |
b389abbe | 2781 | |
54d01ffb DG |
2782 | /* |
2783 | * Command LTTNG_START_TRACE processed by the client thread. | |
2784 | */ | |
2785 | static int cmd_start_trace(struct ltt_session *session) | |
2786 | { | |
2787 | int ret; | |
54d01ffb | 2788 | struct ltt_kernel_session *ksession; |
b9d9b220 | 2789 | struct ltt_ust_session *usess; |
b389abbe | 2790 | |
54d01ffb DG |
2791 | /* Short cut */ |
2792 | ksession = session->kernel_session; | |
b9d9b220 | 2793 | usess = session->ust_session; |
5eb91c98 | 2794 | |
b9ef1c83 DG |
2795 | if (session->enabled) { |
2796 | ret = LTTCOMM_UST_START_FAIL; | |
2797 | goto error; | |
2798 | } | |
2799 | ||
464dd62d MD |
2800 | session->enabled = 1; |
2801 | ||
54d01ffb DG |
2802 | /* Kernel tracing */ |
2803 | if (ksession != NULL) { | |
2bdd86d4 MD |
2804 | struct ltt_kernel_channel *kchan; |
2805 | ||
54d01ffb DG |
2806 | /* Open kernel metadata */ |
2807 | if (ksession->metadata == NULL) { | |
2808 | ret = kernel_open_metadata(ksession, ksession->trace_path); | |
2809 | if (ret < 0) { | |
2810 | ret = LTTCOMM_KERN_META_FAIL; | |
2811 | goto error; | |
b389abbe | 2812 | } |
54d01ffb | 2813 | } |
7d29a247 | 2814 | |
54d01ffb DG |
2815 | /* Open kernel metadata stream */ |
2816 | if (ksession->metadata_stream_fd == 0) { | |
2817 | ret = kernel_open_metadata_stream(ksession); | |
2818 | if (ret < 0) { | |
2819 | ERR("Kernel create metadata stream failed"); | |
2820 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2821 | goto error; | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | /* For each channel */ | |
2826 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { | |
2827 | if (kchan->stream_count == 0) { | |
2828 | ret = kernel_open_channel_stream(kchan); | |
2829 | if (ret < 0) { | |
2830 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
7d29a247 DG |
2831 | goto error; |
2832 | } | |
54d01ffb DG |
2833 | /* Update the stream global counter */ |
2834 | ksession->stream_count_global += ret; | |
7d29a247 | 2835 | } |
54d01ffb DG |
2836 | } |
2837 | ||
2838 | /* Setup kernel consumer socket and send fds to it */ | |
2839 | ret = init_kernel_tracing(ksession); | |
2840 | if (ret < 0) { | |
2841 | ret = LTTCOMM_KERN_START_FAIL; | |
2842 | goto error; | |
2843 | } | |
2844 | ||
2845 | /* This start the kernel tracing */ | |
2846 | ret = kernel_start_session(ksession); | |
2847 | if (ret < 0) { | |
2848 | ret = LTTCOMM_KERN_START_FAIL; | |
2849 | goto error; | |
2850 | } | |
2851 | ||
2852 | /* Quiescent wait after starting trace */ | |
2853 | kernel_wait_quiescent(kernel_tracer_fd); | |
2854 | } | |
2855 | ||
36dc12cc | 2856 | /* Flag session that trace should start automatically */ |
b9d9b220 DG |
2857 | if (usess) { |
2858 | usess->start_trace = 1; | |
36dc12cc | 2859 | |
b9d9b220 DG |
2860 | ret = ust_app_start_trace_all(usess); |
2861 | if (ret < 0) { | |
2862 | ret = LTTCOMM_UST_START_FAIL; | |
2863 | goto error; | |
2864 | } | |
2bdd86d4 | 2865 | } |
54d01ffb DG |
2866 | |
2867 | ret = LTTCOMM_OK; | |
2868 | ||
2869 | error: | |
2870 | return ret; | |
2871 | } | |
2872 | ||
2873 | /* | |
2874 | * Command LTTNG_STOP_TRACE processed by the client thread. | |
2875 | */ | |
2876 | static int cmd_stop_trace(struct ltt_session *session) | |
2877 | { | |
2878 | int ret; | |
2879 | struct ltt_kernel_channel *kchan; | |
2880 | struct ltt_kernel_session *ksession; | |
8be98f9a | 2881 | struct ltt_ust_session *usess; |
54d01ffb DG |
2882 | |
2883 | /* Short cut */ | |
2884 | ksession = session->kernel_session; | |
8be98f9a | 2885 | usess = session->ust_session; |
54d01ffb | 2886 | |
b9ef1c83 DG |
2887 | if (!session->enabled) { |
2888 | ret = LTTCOMM_UST_START_FAIL; | |
2889 | goto error; | |
2890 | } | |
2891 | ||
464dd62d MD |
2892 | session->enabled = 0; |
2893 | ||
54d01ffb DG |
2894 | /* Kernel tracer */ |
2895 | if (ksession != NULL) { | |
2896 | DBG("Stop kernel tracing"); | |
2897 | ||
2898 | /* Flush all buffers before stopping */ | |
2899 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); | |
2900 | if (ret < 0) { | |
2901 | ERR("Kernel metadata flush failed"); | |
2902 | } | |
f34daff7 | 2903 | |
54d01ffb DG |
2904 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
2905 | ret = kernel_flush_buffer(kchan); | |
0d0c377a | 2906 | if (ret < 0) { |
54d01ffb | 2907 | ERR("Kernel flush buffer error"); |
7d29a247 | 2908 | } |
54d01ffb | 2909 | } |
19e70852 | 2910 | |
54d01ffb DG |
2911 | ret = kernel_stop_session(ksession); |
2912 | if (ret < 0) { | |
2913 | ret = LTTCOMM_KERN_STOP_FAIL; | |
19e70852 | 2914 | goto error; |
f3ed775e | 2915 | } |
54d01ffb DG |
2916 | |
2917 | kernel_wait_quiescent(kernel_tracer_fd); | |
894be886 | 2918 | } |
54d01ffb | 2919 | |
8be98f9a MD |
2920 | if (usess) { |
2921 | usess->start_trace = 0; | |
2bdd86d4 | 2922 | |
8be98f9a | 2923 | ret = ust_app_stop_trace_all(usess); |
2bdd86d4 | 2924 | if (ret < 0) { |
8be98f9a | 2925 | ret = LTTCOMM_UST_START_FAIL; |
2bdd86d4 MD |
2926 | goto error; |
2927 | } | |
2bdd86d4 | 2928 | } |
54d01ffb DG |
2929 | |
2930 | ret = LTTCOMM_OK; | |
2931 | ||
2932 | error: | |
2933 | return ret; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * Command LTTNG_CREATE_SESSION processed by the client thread. | |
2938 | */ | |
2939 | static int cmd_create_session(char *name, char *path) | |
2940 | { | |
2941 | int ret; | |
2942 | ||
2943 | ret = session_create(name, path); | |
2944 | if (ret != LTTCOMM_OK) { | |
2945 | goto error; | |
2946 | } | |
2947 | ||
2948 | ret = LTTCOMM_OK; | |
2949 | ||
2950 | error: | |
2951 | return ret; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * Command LTTNG_DESTROY_SESSION processed by the client thread. | |
2956 | */ | |
2957 | static int cmd_destroy_session(struct ltt_session *session, char *name) | |
2958 | { | |
2959 | int ret; | |
2960 | ||
2961 | /* Clean kernel session teardown */ | |
2962 | teardown_kernel_session(session); | |
84cd17c6 MD |
2963 | /* UST session teardown */ |
2964 | teardown_ust_session(session); | |
54d01ffb DG |
2965 | |
2966 | /* | |
2967 | * Must notify the kernel thread here to update it's poll setin order | |
2968 | * to remove the channel(s)' fd just destroyed. | |
2969 | */ | |
2970 | ret = notify_thread_pipe(kernel_poll_pipe[1]); | |
2971 | if (ret < 0) { | |
2972 | perror("write kernel poll pipe"); | |
2973 | } | |
2974 | ||
271933a4 | 2975 | ret = session_destroy(session); |
54d01ffb DG |
2976 | |
2977 | return ret; | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * Command LTTNG_CALIBRATE processed by the client thread. | |
2982 | */ | |
2983 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) | |
2984 | { | |
2985 | int ret; | |
2986 | ||
2987 | switch (domain) { | |
2988 | case LTTNG_DOMAIN_KERNEL: | |
33a2b854 | 2989 | { |
54d01ffb | 2990 | struct lttng_kernel_calibrate kcalibrate; |
33a2b854 | 2991 | |
54d01ffb DG |
2992 | kcalibrate.type = calibrate->type; |
2993 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
33a2b854 | 2994 | if (ret < 0) { |
54d01ffb DG |
2995 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
2996 | goto error; | |
33a2b854 | 2997 | } |
54d01ffb DG |
2998 | break; |
2999 | } | |
3000 | default: | |
3001 | /* TODO: Userspace tracing */ | |
3002 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3003 | goto error; | |
3004 | } | |
33a2b854 | 3005 | |
54d01ffb | 3006 | ret = LTTCOMM_OK; |
33a2b854 | 3007 | |
54d01ffb DG |
3008 | error: |
3009 | return ret; | |
3010 | } | |
7d29a247 | 3011 | |
54d01ffb DG |
3012 | /* |
3013 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. | |
3014 | */ | |
3015 | static int cmd_register_consumer(struct ltt_session *session, int domain, | |
3016 | char *sock_path) | |
3017 | { | |
3018 | int ret, sock; | |
b389abbe | 3019 | |
54d01ffb DG |
3020 | switch (domain) { |
3021 | case LTTNG_DOMAIN_KERNEL: | |
3022 | /* Can't register a consumer if there is already one */ | |
48c4f28c | 3023 | if (session->kernel_session->consumer_fds_sent != 0) { |
54d01ffb DG |
3024 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3025 | goto error; | |
3026 | } | |
3027 | ||
3028 | sock = lttcomm_connect_unix_sock(sock_path); | |
3029 | if (sock < 0) { | |
3030 | ret = LTTCOMM_CONNECT_FAIL; | |
3031 | goto error; | |
3032 | } | |
3033 | ||
3034 | session->kernel_session->consumer_fd = sock; | |
3035 | break; | |
3036 | default: | |
3037 | /* TODO: Userspace tracing */ | |
3038 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
3039 | goto error; | |
3040 | } | |
3041 | ||
3042 | ret = LTTCOMM_OK; | |
3043 | ||
3044 | error: | |
3045 | return ret; | |
3046 | } | |
3047 | ||
3048 | /* | |
3049 | * Command LTTNG_LIST_DOMAINS processed by the client thread. | |
3050 | */ | |
3051 | static ssize_t cmd_list_domains(struct ltt_session *session, | |
3052 | struct lttng_domain **domains) | |
3053 | { | |
b551a063 | 3054 | int ret, index = 0; |
54d01ffb DG |
3055 | ssize_t nb_dom = 0; |
3056 | ||
3057 | if (session->kernel_session != NULL) { | |
b551a063 | 3058 | DBG3("Listing domains found kernel domain"); |
54d01ffb DG |
3059 | nb_dom++; |
3060 | } | |
3061 | ||
b551a063 DG |
3062 | if (session->ust_session != NULL) { |
3063 | DBG3("Listing domains found UST global domain"); | |
3064 | nb_dom++; | |
3065 | } | |
54d01ffb | 3066 | |
b551a063 | 3067 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
54d01ffb DG |
3068 | if (*domains == NULL) { |
3069 | ret = -LTTCOMM_FATAL; | |
3070 | goto error; | |
3071 | } | |
3072 | ||
b551a063 DG |
3073 | if (session->kernel_session != NULL) { |
3074 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; | |
3075 | index++; | |
3076 | } | |
3077 | ||
3078 | if (session->ust_session != NULL) { | |
3079 | (*domains)[index].type = LTTNG_DOMAIN_UST; | |
3080 | index++; | |
3081 | } | |
54d01ffb | 3082 | |
54d01ffb DG |
3083 | return nb_dom; |
3084 | ||
3085 | error: | |
3086 | return ret; | |
3087 | } | |
3088 | ||
3089 | /* | |
3090 | * Command LTTNG_LIST_CHANNELS processed by the client thread. | |
3091 | */ | |
b551a063 | 3092 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
54d01ffb DG |
3093 | struct lttng_channel **channels) |
3094 | { | |
3095 | int ret; | |
3096 | ssize_t nb_chan = 0; | |
3097 | ||
b551a063 DG |
3098 | switch (domain) { |
3099 | case LTTNG_DOMAIN_KERNEL: | |
3100 | if (session->kernel_session != NULL) { | |
3101 | nb_chan = session->kernel_session->channel_count; | |
3102 | } | |
0df502fd | 3103 | DBG3("Number of kernel channels %zd", nb_chan); |
b551a063 DG |
3104 | break; |
3105 | case LTTNG_DOMAIN_UST: | |
3106 | if (session->ust_session != NULL) { | |
3107 | nb_chan = hashtable_get_count( | |
3108 | session->ust_session->domain_global.channels); | |
3109 | } | |
0df502fd | 3110 | DBG3("Number of UST global channels %zd", nb_chan); |
b551a063 DG |
3111 | break; |
3112 | default: | |
3113 | *channels = NULL; | |
3114 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3115 | goto error; |
3116 | } | |
3117 | ||
b551a063 DG |
3118 | if (nb_chan > 0) { |
3119 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); | |
3120 | if (*channels == NULL) { | |
3121 | ret = -LTTCOMM_FATAL; | |
3122 | goto error; | |
3123 | } | |
54d01ffb | 3124 | |
b551a063 DG |
3125 | list_lttng_channels(domain, session, *channels); |
3126 | } else { | |
3127 | *channels = NULL; | |
3128 | } | |
2bdd86d4 | 3129 | |
54d01ffb DG |
3130 | return nb_chan; |
3131 | ||
3132 | error: | |
3133 | return ret; | |
3134 | } | |
3135 | ||
3136 | /* | |
3137 | * Command LTTNG_LIST_EVENTS processed by the client thread. | |
3138 | */ | |
b551a063 | 3139 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
54d01ffb DG |
3140 | char *channel_name, struct lttng_event **events) |
3141 | { | |
b551a063 | 3142 | int ret = 0; |
54d01ffb | 3143 | ssize_t nb_event = 0; |
54d01ffb | 3144 | |
b551a063 DG |
3145 | switch (domain) { |
3146 | case LTTNG_DOMAIN_KERNEL: | |
3147 | if (session->kernel_session != NULL) { | |
3148 | nb_event = list_lttng_kernel_events(channel_name, | |
3149 | session->kernel_session, events); | |
54d01ffb | 3150 | } |
b551a063 DG |
3151 | break; |
3152 | case LTTNG_DOMAIN_UST: | |
3153 | { | |
3154 | if (session->ust_session != NULL) { | |
3155 | nb_event = list_lttng_ust_global_events(channel_name, | |
3156 | &session->ust_session->domain_global, events); | |
3157 | } | |
3158 | break; | |
54d01ffb | 3159 | } |
b551a063 DG |
3160 | default: |
3161 | ret = -LTTCOMM_NOT_IMPLEMENTED; | |
54d01ffb DG |
3162 | goto error; |
3163 | } | |
3164 | ||
b551a063 | 3165 | ret = nb_event; |
54d01ffb DG |
3166 | |
3167 | error: | |
3168 | return ret; | |
3169 | } | |
3170 | ||
3171 | /* | |
3172 | * Process the command requested by the lttng client within the command | |
3173 | * context structure. This function make sure that the return structure (llm) | |
3174 | * is set and ready for transmission before returning. | |
3175 | * | |
3176 | * Return any error encountered or 0 for success. | |
3177 | */ | |
3178 | static int process_client_msg(struct command_ctx *cmd_ctx) | |
3179 | { | |
3180 | int ret = LTTCOMM_OK; | |
44d3bd01 | 3181 | int need_tracing_session = 1; |
54d01ffb DG |
3182 | |
3183 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
3184 | ||
4fba7219 DG |
3185 | if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
3186 | ret = LTTCOMM_KERN_NA; | |
3187 | goto error; | |
3188 | } | |
3189 | ||
54d01ffb DG |
3190 | /* |
3191 | * Check for command that don't needs to allocate a returned payload. We do | |
44d3bd01 | 3192 | * this here so we don't have to make the call for no payload at each |
54d01ffb DG |
3193 | * command. |
3194 | */ | |
3195 | switch(cmd_ctx->lsm->cmd_type) { | |
3196 | case LTTNG_LIST_SESSIONS: | |
3197 | case LTTNG_LIST_TRACEPOINTS: | |
3198 | case LTTNG_LIST_DOMAINS: | |
3199 | case LTTNG_LIST_CHANNELS: | |
3200 | case LTTNG_LIST_EVENTS: | |
3201 | break; | |
3202 | default: | |
3203 | /* Setup lttng message with no payload */ | |
3204 | ret = setup_lttng_msg(cmd_ctx, 0); | |
3205 | if (ret < 0) { | |
3206 | /* This label does not try to unlock the session */ | |
3207 | goto init_setup_error; | |
3208 | } | |
3209 | } | |
3210 | ||
3211 | /* Commands that DO NOT need a session. */ | |
3212 | switch (cmd_ctx->lsm->cmd_type) { | |
3213 | case LTTNG_CALIBRATE: | |
3214 | case LTTNG_CREATE_SESSION: | |
3215 | case LTTNG_LIST_SESSIONS: | |
3216 | case LTTNG_LIST_TRACEPOINTS: | |
44d3bd01 | 3217 | need_tracing_session = 0; |
54d01ffb DG |
3218 | break; |
3219 | default: | |
3220 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
74babd95 | 3221 | session_lock_list(); |
54d01ffb | 3222 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
74babd95 | 3223 | session_unlock_list(); |
54d01ffb DG |
3224 | if (cmd_ctx->session == NULL) { |
3225 | if (cmd_ctx->lsm->session.name != NULL) { | |
3226 | ret = LTTCOMM_SESS_NOT_FOUND; | |
3227 | } else { | |
3228 | /* If no session name specified */ | |
3229 | ret = LTTCOMM_SELECT_SESS; | |
3230 | } | |
3231 | goto error; | |
3232 | } else { | |
3233 | /* Acquire lock for the session */ | |
3234 | session_lock(cmd_ctx->session); | |
3235 | } | |
3236 | break; | |
3237 | } | |
b389abbe | 3238 | |
54d01ffb DG |
3239 | /* |
3240 | * Check domain type for specific "pre-action". | |
3241 | */ | |
3242 | switch (cmd_ctx->lsm->domain.type) { | |
3243 | case LTTNG_DOMAIN_KERNEL: | |
3244 | /* Kernel tracer check */ | |
3245 | if (kernel_tracer_fd == 0) { | |
3246 | /* Basically, load kernel tracer modules */ | |
3247 | init_kernel_tracer(); | |
3248 | if (kernel_tracer_fd == 0) { | |
3249 | ret = LTTCOMM_KERN_NA; | |
3250 | goto error; | |
3251 | } | |
3252 | } | |
5eb91c98 | 3253 | |
54d01ffb | 3254 | /* Need a session for kernel command */ |
44d3bd01 | 3255 | if (need_tracing_session) { |
54d01ffb | 3256 | if (cmd_ctx->session->kernel_session == NULL) { |
be040666 | 3257 | ret = create_kernel_session(cmd_ctx->session, &cmd_ctx->creds); |
5eb91c98 | 3258 | if (ret < 0) { |
54d01ffb | 3259 | ret = LTTCOMM_KERN_SESS_FAIL; |
5eb91c98 DG |
3260 | goto error; |
3261 | } | |
b389abbe | 3262 | } |
7d29a247 | 3263 | |
54d01ffb | 3264 | /* Start the kernel consumer daemon */ |
3bd1e081 MD |
3265 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
3266 | if (kconsumer_data.pid == 0 && | |
54d01ffb | 3267 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
3bd1e081 MD |
3268 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
3269 | ret = start_consumerd(&kconsumer_data); | |
7d29a247 | 3270 | if (ret < 0) { |
54d01ffb DG |
3271 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
3272 | goto error; | |
950131af | 3273 | } |
3ff2ecac MD |
3274 | } else { |
3275 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
33a2b854 | 3276 | } |
0d0c377a | 3277 | } |
54d01ffb | 3278 | break; |
2bdd86d4 | 3279 | case LTTNG_DOMAIN_UST: |
44d3bd01 | 3280 | { |
44d3bd01 | 3281 | if (need_tracing_session) { |
f6a9efaa | 3282 | if (cmd_ctx->session->ust_session == NULL) { |
44d3bd01 | 3283 | ret = create_ust_session(cmd_ctx->session, |
be040666 | 3284 | &cmd_ctx->lsm->domain, &cmd_ctx->creds); |
44d3bd01 DG |
3285 | if (ret != LTTCOMM_OK) { |
3286 | goto error; | |
3287 | } | |
3288 | } | |
7753dea8 MD |
3289 | /* Start the UST consumer daemons */ |
3290 | /* 64-bit */ | |
3291 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
fc7a59ce | 3292 | if (consumerd64_bin[0] != '\0' && |
7753dea8 | 3293 | ustconsumer64_data.pid == 0 && |
2bdd86d4 | 3294 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
7753dea8 MD |
3295 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3296 | ret = start_consumerd(&ustconsumer64_data); | |
2bdd86d4 | 3297 | if (ret < 0) { |
7753dea8 MD |
3298 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
3299 | ust_consumerd64_fd = -EINVAL; | |
2bdd86d4 MD |
3300 | goto error; |
3301 | } | |
48842b30 | 3302 | |
7753dea8 | 3303 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
3ff2ecac | 3304 | } else { |
7753dea8 MD |
3305 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
3306 | } | |
3307 | /* 32-bit */ | |
fc7a59ce | 3308 | if (consumerd32_bin[0] != '\0' && |
7753dea8 MD |
3309 | ustconsumer32_data.pid == 0 && |
3310 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
3311 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
3312 | ret = start_consumerd(&ustconsumer32_data); | |
3313 | if (ret < 0) { | |
3314 | ret = LTTCOMM_UST_CONSUMER32_FAIL; | |
3315 | ust_consumerd32_fd = -EINVAL; | |
3316 | goto error; | |
3317 | } | |
3318 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; | |
3319 | } else { | |
3320 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
2bdd86d4 | 3321 | } |
44d3bd01 DG |
3322 | } |
3323 | break; | |
48842b30 | 3324 | } |
54d01ffb | 3325 | default: |
54d01ffb DG |
3326 | break; |
3327 | } | |
33a2b854 | 3328 | |
54d01ffb DG |
3329 | /* Process by command type */ |
3330 | switch (cmd_ctx->lsm->cmd_type) { | |
3331 | case LTTNG_ADD_CONTEXT: | |
3332 | { | |
3333 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3334 | cmd_ctx->lsm->u.context.channel_name, | |
3335 | cmd_ctx->lsm->u.context.event_name, | |
3336 | &cmd_ctx->lsm->u.context.ctx); | |
3337 | break; | |
3338 | } | |
3339 | case LTTNG_DISABLE_CHANNEL: | |
3340 | { | |
3341 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3342 | cmd_ctx->lsm->u.disable.channel_name); | |
3343 | break; | |
3344 | } | |
3345 | case LTTNG_DISABLE_EVENT: | |
3346 | { | |
3347 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3348 | cmd_ctx->lsm->u.disable.channel_name, | |
3349 | cmd_ctx->lsm->u.disable.name); | |
33a2b854 DG |
3350 | ret = LTTCOMM_OK; |
3351 | break; | |
3352 | } | |
54d01ffb DG |
3353 | case LTTNG_DISABLE_ALL_EVENT: |
3354 | { | |
2bdd86d4 | 3355 | DBG("Disabling all events"); |
54d01ffb DG |
3356 | |
3357 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3358 | cmd_ctx->lsm->u.disable.channel_name); | |
3359 | break; | |
3360 | } | |
3361 | case LTTNG_ENABLE_CHANNEL: | |
3362 | { | |
aea829b3 | 3363 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
54d01ffb DG |
3364 | &cmd_ctx->lsm->u.channel.chan); |
3365 | break; | |
3366 | } | |
3367 | case LTTNG_ENABLE_EVENT: | |
3368 | { | |
3369 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
3370 | cmd_ctx->lsm->u.enable.channel_name, | |
3371 | &cmd_ctx->lsm->u.enable.event); | |
3372 | break; | |
3373 | } | |
3374 | case LTTNG_ENABLE_ALL_EVENT: | |
3375 | { | |
2bdd86d4 | 3376 | DBG("Enabling all events"); |
54d01ffb DG |
3377 | |
3378 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
8c9ae521 DG |
3379 | cmd_ctx->lsm->u.enable.channel_name, |
3380 | cmd_ctx->lsm->u.enable.event.type); | |
54d01ffb DG |
3381 | break; |
3382 | } | |
052da939 | 3383 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 3384 | { |
9f19cc17 | 3385 | struct lttng_event *events; |
54d01ffb | 3386 | ssize_t nb_events; |
052da939 | 3387 | |
54d01ffb DG |
3388 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
3389 | if (nb_events < 0) { | |
3390 | ret = -nb_events; | |
3391 | goto error; | |
2ef84c95 DG |
3392 | } |
3393 | ||
3394 | /* | |
3395 | * Setup lttng message with payload size set to the event list size in | |
3396 | * bytes and then copy list into the llm payload. | |
3397 | */ | |
052da939 | 3398 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3399 | if (ret < 0) { |
052da939 | 3400 | free(events); |
2ef84c95 DG |
3401 | goto setup_error; |
3402 | } | |
3403 | ||
3404 | /* Copy event list into message payload */ | |
9f19cc17 | 3405 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 3406 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 3407 | |
9f19cc17 | 3408 | free(events); |
2ef84c95 DG |
3409 | |
3410 | ret = LTTCOMM_OK; | |
3411 | break; | |
3412 | } | |
f3ed775e | 3413 | case LTTNG_START_TRACE: |
8c0faa1d | 3414 | { |
54d01ffb | 3415 | ret = cmd_start_trace(cmd_ctx->session); |
8c0faa1d DG |
3416 | break; |
3417 | } | |
f3ed775e | 3418 | case LTTNG_STOP_TRACE: |
8c0faa1d | 3419 | { |
54d01ffb | 3420 | ret = cmd_stop_trace(cmd_ctx->session); |
8c0faa1d DG |
3421 | break; |
3422 | } | |
5e16da05 MD |
3423 | case LTTNG_CREATE_SESSION: |
3424 | { | |
54d01ffb DG |
3425 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
3426 | cmd_ctx->lsm->session.path); | |
5e16da05 MD |
3427 | break; |
3428 | } | |
3429 | case LTTNG_DESTROY_SESSION: | |
3430 | { | |
54d01ffb DG |
3431 | ret = cmd_destroy_session(cmd_ctx->session, |
3432 | cmd_ctx->lsm->session.name); | |
5461b305 | 3433 | break; |
5e16da05 | 3434 | } |
9f19cc17 | 3435 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 3436 | { |
54d01ffb DG |
3437 | ssize_t nb_dom; |
3438 | struct lttng_domain *domains; | |
5461b305 | 3439 | |
54d01ffb DG |
3440 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
3441 | if (nb_dom < 0) { | |
3442 | ret = -nb_dom; | |
3443 | goto error; | |
ce3d728c | 3444 | } |
520ff687 | 3445 | |
54d01ffb | 3446 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
5461b305 DG |
3447 | if (ret < 0) { |
3448 | goto setup_error; | |
520ff687 | 3449 | } |
57167058 | 3450 | |
54d01ffb DG |
3451 | /* Copy event list into message payload */ |
3452 | memcpy(cmd_ctx->llm->payload, domains, | |
3453 | nb_dom * sizeof(struct lttng_domain)); | |
3454 | ||
3455 | free(domains); | |
5e16da05 | 3456 | |
5461b305 | 3457 | ret = LTTCOMM_OK; |
5e16da05 MD |
3458 | break; |
3459 | } | |
9f19cc17 | 3460 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 3461 | { |
54d01ffb DG |
3462 | size_t nb_chan; |
3463 | struct lttng_channel *channels; | |
3464 | ||
b551a063 DG |
3465 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
3466 | cmd_ctx->session, &channels); | |
54d01ffb DG |
3467 | if (nb_chan < 0) { |
3468 | ret = -nb_chan; | |
3469 | goto error; | |
5461b305 | 3470 | } |
ca95a216 | 3471 | |
54d01ffb | 3472 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
5461b305 DG |
3473 | if (ret < 0) { |
3474 | goto setup_error; | |
3475 | } | |
9f19cc17 | 3476 | |
54d01ffb DG |
3477 | /* Copy event list into message payload */ |
3478 | memcpy(cmd_ctx->llm->payload, channels, | |
3479 | nb_chan * sizeof(struct lttng_channel)); | |
3480 | ||
3481 | free(channels); | |
9f19cc17 DG |
3482 | |
3483 | ret = LTTCOMM_OK; | |
5461b305 | 3484 | break; |
5e16da05 | 3485 | } |
9f19cc17 | 3486 | case LTTNG_LIST_EVENTS: |
5e16da05 | 3487 | { |
b551a063 | 3488 | ssize_t nb_event; |
684d34d2 | 3489 | struct lttng_event *events = NULL; |
9f19cc17 | 3490 | |
b551a063 | 3491 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
54d01ffb DG |
3492 | cmd_ctx->lsm->u.list.channel_name, &events); |
3493 | if (nb_event < 0) { | |
3494 | ret = -nb_event; | |
3495 | goto error; | |
5461b305 | 3496 | } |
ca95a216 | 3497 | |
54d01ffb | 3498 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
5461b305 DG |
3499 | if (ret < 0) { |
3500 | goto setup_error; | |
3501 | } | |
9f19cc17 | 3502 | |
54d01ffb DG |
3503 | /* Copy event list into message payload */ |
3504 | memcpy(cmd_ctx->llm->payload, events, | |
3505 | nb_event * sizeof(struct lttng_event)); | |
9f19cc17 | 3506 | |
54d01ffb | 3507 | free(events); |
9f19cc17 DG |
3508 | |
3509 | ret = LTTCOMM_OK; | |
5461b305 | 3510 | break; |
5e16da05 MD |
3511 | } |
3512 | case LTTNG_LIST_SESSIONS: | |
3513 | { | |
54d01ffb | 3514 | session_lock_list(); |
5461b305 | 3515 | |
6c9cc2ab | 3516 | if (session_list_ptr->count == 0) { |
f3ed775e | 3517 | ret = LTTCOMM_NO_SESSION; |
54d01ffb | 3518 | session_unlock_list(); |
5461b305 | 3519 | goto error; |
57167058 | 3520 | } |
5e16da05 | 3521 | |
6c9cc2ab DG |
3522 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
3523 | session_list_ptr->count); | |
5461b305 | 3524 | if (ret < 0) { |
54d01ffb | 3525 | session_unlock_list(); |
5461b305 | 3526 | goto setup_error; |
e065084a | 3527 | } |
5e16da05 | 3528 | |
6c9cc2ab DG |
3529 | /* Filled the session array */ |
3530 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
3531 | ||
54d01ffb | 3532 | session_unlock_list(); |
5e16da05 | 3533 | |
5461b305 | 3534 | ret = LTTCOMM_OK; |
5e16da05 MD |
3535 | break; |
3536 | } | |
d0254c7c MD |
3537 | case LTTNG_CALIBRATE: |
3538 | { | |
54d01ffb DG |
3539 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
3540 | &cmd_ctx->lsm->u.calibrate); | |
d0254c7c MD |
3541 | break; |
3542 | } | |
d9800920 DG |
3543 | case LTTNG_REGISTER_CONSUMER: |
3544 | { | |
54d01ffb DG |
3545 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
3546 | cmd_ctx->lsm->u.reg.path); | |
d9800920 DG |
3547 | break; |
3548 | } | |
5e16da05 | 3549 | default: |
5e16da05 | 3550 | ret = LTTCOMM_UND; |
5461b305 | 3551 | break; |
fac6795d DG |
3552 | } |
3553 | ||
5461b305 | 3554 | error: |
5461b305 DG |
3555 | if (cmd_ctx->llm == NULL) { |
3556 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 3557 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
3558 | goto setup_error; |
3559 | } | |
3560 | } | |
54d01ffb | 3561 | /* Set return code */ |
5461b305 | 3562 | cmd_ctx->llm->ret_code = ret; |
5461b305 | 3563 | setup_error: |
b5541356 | 3564 | if (cmd_ctx->session) { |
54d01ffb | 3565 | session_unlock(cmd_ctx->session); |
b5541356 | 3566 | } |
54d01ffb | 3567 | init_setup_error: |
8028d920 | 3568 | return ret; |
fac6795d DG |
3569 | } |
3570 | ||
1d4b027a | 3571 | /* |
d063d709 DG |
3572 | * This thread manage all clients request using the unix client socket for |
3573 | * communication. | |
1d4b027a DG |
3574 | */ |
3575 | static void *thread_manage_clients(void *data) | |
3576 | { | |
5eb91c98 DG |
3577 | int sock = 0, ret, i, pollfd; |
3578 | uint32_t revents, nb_fd; | |
273ea72c | 3579 | struct command_ctx *cmd_ctx = NULL; |
5eb91c98 | 3580 | struct lttng_poll_event events; |
1d4b027a DG |
3581 | |
3582 | DBG("[thread] Manage client started"); | |
3583 | ||
f6a9efaa DG |
3584 | rcu_register_thread(); |
3585 | ||
1d4b027a DG |
3586 | ret = lttcomm_listen_unix_sock(client_sock); |
3587 | if (ret < 0) { | |
3588 | goto error; | |
3589 | } | |
3590 | ||
5eb91c98 DG |
3591 | /* |
3592 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
3593 | * more will be added to this poll set. | |
3594 | */ | |
3595 | ret = create_thread_poll_set(&events, 2); | |
3596 | if (ret < 0) { | |
3597 | goto error; | |
3598 | } | |
273ea72c | 3599 | |
5eb91c98 DG |
3600 | /* Add the application registration socket */ |
3601 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
3602 | if (ret < 0) { | |
3603 | goto error; | |
3604 | } | |
273ea72c | 3605 | |
bbd973c2 DG |
3606 | /* |
3607 | * Notify parent pid that we are ready to accept command for client side. | |
1d4b027a DG |
3608 | */ |
3609 | if (opt_sig_parent) { | |
3610 | kill(ppid, SIGCHLD); | |
3611 | } | |
3612 | ||
3613 | while (1) { | |
1d4b027a | 3614 | DBG("Accepting client command ..."); |
273ea72c | 3615 | |
5eb91c98 DG |
3616 | nb_fd = LTTNG_POLL_GETNB(&events); |
3617 | ||
273ea72c | 3618 | /* Inifinite blocking call, waiting for transmission */ |
5eb91c98 | 3619 | ret = lttng_poll_wait(&events, -1); |
273ea72c | 3620 | if (ret < 0) { |
273ea72c DG |
3621 | goto error; |
3622 | } | |
3623 | ||
5eb91c98 DG |
3624 | for (i = 0; i < nb_fd; i++) { |
3625 | /* Fetch once the poll data */ | |
3626 | revents = LTTNG_POLL_GETEV(&events, i); | |
3627 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
3628 | ||
3629 | /* Thread quit pipe has been closed. Killing thread. */ | |
3630 | ret = check_thread_quit_pipe(pollfd, revents); | |
3631 | if (ret) { | |
3632 | goto error; | |
3633 | } | |
3634 | ||
3635 | /* Event on the registration socket */ | |
3636 | if (pollfd == client_sock) { | |
3637 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
3638 | ERR("Client socket poll error"); | |
3639 | goto error; | |
3640 | } | |
3641 | } | |
3642 | } | |
3643 | ||
3644 | DBG("Wait for client response"); | |
3645 | ||
3646 | sock = lttcomm_accept_unix_sock(client_sock); | |
3647 | if (sock < 0) { | |
273ea72c | 3648 | goto error; |
273ea72c DG |
3649 | } |
3650 | ||
be040666 DG |
3651 | /* Set socket option for credentials retrieval */ |
3652 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
3653 | if (ret < 0) { | |
3654 | goto error; | |
3655 | } | |
3656 | ||
5eb91c98 | 3657 | /* Allocate context command to process the client request */ |
ba7f0ae5 | 3658 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
5eb91c98 | 3659 | if (cmd_ctx == NULL) { |
ba7f0ae5 | 3660 | perror("zmalloc cmd_ctx"); |
1d4b027a | 3661 | goto error; |
5eb91c98 | 3662 | } |
1d4b027a | 3663 | |
5eb91c98 | 3664 | /* Allocate data buffer for reception */ |
ba7f0ae5 | 3665 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
5eb91c98 | 3666 | if (cmd_ctx->lsm == NULL) { |
ba7f0ae5 | 3667 | perror("zmalloc cmd_ctx->lsm"); |
5eb91c98 DG |
3668 | goto error; |
3669 | } | |
1d4b027a | 3670 | |
5eb91c98 DG |
3671 | cmd_ctx->llm = NULL; |
3672 | cmd_ctx->session = NULL; | |
1d4b027a | 3673 | |
5eb91c98 DG |
3674 | /* |
3675 | * Data is received from the lttng client. The struct | |
3676 | * lttcomm_session_msg (lsm) contains the command and data request of | |
3677 | * the client. | |
3678 | */ | |
3679 | DBG("Receiving data from client ..."); | |
be040666 DG |
3680 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
3681 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
5eb91c98 DG |
3682 | if (ret <= 0) { |
3683 | DBG("Nothing recv() from client... continuing"); | |
3684 | close(sock); | |
3685 | free(cmd_ctx); | |
3686 | continue; | |
3687 | } | |
1d4b027a | 3688 | |
5eb91c98 DG |
3689 | // TODO: Validate cmd_ctx including sanity check for |
3690 | // security purpose. | |
f7776ea7 | 3691 | |
f6a9efaa | 3692 | rcu_thread_online(); |
5eb91c98 DG |
3693 | /* |
3694 | * This function dispatch the work to the kernel or userspace tracer | |
3695 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
3696 | * informations for the client. The command context struct contains | |
3697 | * everything this function may needs. | |
3698 | */ | |
3699 | ret = process_client_msg(cmd_ctx); | |
f6a9efaa | 3700 | rcu_thread_offline(); |
5eb91c98 | 3701 | if (ret < 0) { |
bbd973c2 | 3702 | /* |
5eb91c98 | 3703 | * TODO: Inform client somehow of the fatal error. At |
ba7f0ae5 | 3704 | * this point, ret < 0 means that a zmalloc failed |
5eb91c98 | 3705 | * (ENOMEM). Error detected but still accept command. |
bbd973c2 | 3706 | */ |
bbd973c2 | 3707 | clean_command_ctx(&cmd_ctx); |
5eb91c98 DG |
3708 | continue; |
3709 | } | |
d6e4fca4 | 3710 | |
54d01ffb DG |
3711 | DBG("Sending response (size: %d, retcode: %s)", |
3712 | cmd_ctx->lttng_msg_size, | |
9a745bc7 | 3713 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
54d01ffb | 3714 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
5eb91c98 DG |
3715 | if (ret < 0) { |
3716 | ERR("Failed to send data back to client"); | |
bbd973c2 | 3717 | } |
1d4b027a | 3718 | |
5eb91c98 | 3719 | /* End of transmission */ |
273ea72c | 3720 | close(sock); |
be040666 DG |
3721 | |
3722 | clean_command_ctx(&cmd_ctx); | |
273ea72c DG |
3723 | } |
3724 | ||
5eb91c98 DG |
3725 | error: |
3726 | DBG("Client thread dying"); | |
273ea72c | 3727 | unlink(client_unix_sock_path); |
5eb91c98 DG |
3728 | close(client_sock); |
3729 | close(sock); | |
273ea72c | 3730 | |
5eb91c98 | 3731 | lttng_poll_clean(&events); |
a2fb29a5 | 3732 | clean_command_ctx(&cmd_ctx); |
f6a9efaa DG |
3733 | |
3734 | rcu_unregister_thread(); | |
1d4b027a DG |
3735 | return NULL; |
3736 | } | |
3737 | ||
3738 | ||
fac6795d DG |
3739 | /* |
3740 | * usage function on stderr | |
3741 | */ | |
3742 | static void usage(void) | |
3743 | { | |
b716ce68 | 3744 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
3745 | fprintf(stderr, " -h, --help Display this usage.\n"); |
3746 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
3747 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
3748 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
3749 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
7753dea8 MD |
3750 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
3751 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); | |
3752 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); | |
3753 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); | |
ebaeda94 MD |
3754 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
3755 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); | |
3756 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); | |
3757 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); | |
d6f42150 DG |
3758 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
3759 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
3760 | fprintf(stderr, " -V, --version Show version number.\n"); | |
3761 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
3762 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3763 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
3bd1e081 | 3764 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
4fba7219 | 3765 | fprintf(stderr, " --no-kernel Disable kernel tracer\n"); |
fac6795d DG |
3766 | } |
3767 | ||
3768 | /* | |
3769 | * daemon argument parsing | |
3770 | */ | |
3771 | static int parse_args(int argc, char **argv) | |
3772 | { | |
3773 | int c; | |
3774 | ||
3775 | static struct option long_options[] = { | |
3776 | { "client-sock", 1, 0, 'c' }, | |
3777 | { "apps-sock", 1, 0, 'a' }, | |
3bd1e081 MD |
3778 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
3779 | { "kconsumerd-err-sock", 1, 0, 'E' }, | |
7753dea8 MD |
3780 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
3781 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, | |
ebaeda94 MD |
3782 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
3783 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, | |
3784 | { "consumerd32-path", 1, 0, 'u' }, | |
3785 | { "consumerd32-libdir", 1, 0, 'U' }, | |
3786 | { "consumerd64-path", 1, 0, 't' }, | |
3787 | { "consumerd64-libdir", 1, 0, 'T' }, | |
fac6795d | 3788 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 3789 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
3790 | { "help", 0, 0, 'h' }, |
3791 | { "group", 1, 0, 'g' }, | |
3792 | { "version", 0, 0, 'V' }, | |
75462a81 | 3793 | { "quiet", 0, 0, 'q' }, |
3f9947db | 3794 | { "verbose", 0, 0, 'v' }, |
3bd1e081 | 3795 | { "verbose-consumer", 0, 0, 'Z' }, |
4fba7219 | 3796 | { "no-kernel", 0, 0, 'N' }, |
fac6795d DG |
3797 | { NULL, 0, 0, 0 } |
3798 | }; | |
3799 | ||
3800 | while (1) { | |
3801 | int option_index = 0; | |
4fba7219 | 3802 | c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t", |
54d01ffb | 3803 | long_options, &option_index); |
fac6795d DG |
3804 | if (c == -1) { |
3805 | break; | |
3806 | } | |
3807 | ||
3808 | switch (c) { | |
3809 | case 0: | |
3810 | fprintf(stderr, "option %s", long_options[option_index].name); | |
3811 | if (optarg) { | |
3812 | fprintf(stderr, " with arg %s\n", optarg); | |
3813 | } | |
3814 | break; | |
b716ce68 | 3815 | case 'c': |
fac6795d DG |
3816 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
3817 | break; | |
3818 | case 'a': | |
3819 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
3820 | break; | |
3821 | case 'd': | |
3822 | opt_daemon = 1; | |
3823 | break; | |
3824 | case 'g': | |
fb09408a | 3825 | opt_tracing_group = optarg; |
fac6795d DG |
3826 | break; |
3827 | case 'h': | |
3828 | usage(); | |
3829 | exit(EXIT_FAILURE); | |
3830 | case 'V': | |
3831 | fprintf(stdout, "%s\n", VERSION); | |
3832 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
3833 | case 'S': |
3834 | opt_sig_parent = 1; | |
3835 | break; | |
d6f42150 | 3836 | case 'E': |
3bd1e081 | 3837 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
d6f42150 DG |
3838 | break; |
3839 | case 'C': | |
3bd1e081 MD |
3840 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3841 | break; | |
3842 | case 'F': | |
7753dea8 | 3843 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
3bd1e081 MD |
3844 | break; |
3845 | case 'D': | |
7753dea8 MD |
3846 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
3847 | break; | |
3848 | case 'H': | |
3849 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); | |
3850 | break; | |
3851 | case 'G': | |
3852 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
d6f42150 | 3853 | break; |
4fba7219 DG |
3854 | case 'N': |
3855 | opt_no_kernel = 1; | |
3856 | break; | |
75462a81 DG |
3857 | case 'q': |
3858 | opt_quiet = 1; | |
3859 | break; | |
3f9947db | 3860 | case 'v': |
53086306 DG |
3861 | /* Verbose level can increase using multiple -v */ |
3862 | opt_verbose += 1; | |
3f9947db | 3863 | break; |
31f73cc9 | 3864 | case 'Z': |
3bd1e081 | 3865 | opt_verbose_consumer += 1; |
31f73cc9 | 3866 | break; |
fb09408a | 3867 | case 'u': |
fc7a59ce | 3868 | consumerd32_bin= optarg; |
ebaeda94 MD |
3869 | break; |
3870 | case 'U': | |
3871 | consumerd32_libdir = optarg; | |
7753dea8 MD |
3872 | break; |
3873 | case 't': | |
fc7a59ce | 3874 | consumerd64_bin = optarg; |
ebaeda94 MD |
3875 | break; |
3876 | case 'T': | |
3877 | consumerd64_libdir = optarg; | |
fb09408a | 3878 | break; |
fac6795d DG |
3879 | default: |
3880 | /* Unknown option or other error. | |
3881 | * Error is printed by getopt, just return */ | |
3882 | return -1; | |
3883 | } | |
3884 | } | |
3885 | ||
3886 | return 0; | |
3887 | } | |
3888 | ||
3889 | /* | |
d063d709 | 3890 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
3891 | * apps_sock - The communication socket for all UST apps. |
3892 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 3893 | */ |
cf3af59e | 3894 | static int init_daemon_socket(void) |
fac6795d DG |
3895 | { |
3896 | int ret = 0; | |
3897 | mode_t old_umask; | |
3898 | ||
3899 | old_umask = umask(0); | |
3900 | ||
3901 | /* Create client tool unix socket */ | |
d6f42150 DG |
3902 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
3903 | if (client_sock < 0) { | |
3904 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
3905 | ret = -1; |
3906 | goto end; | |
3907 | } | |
3908 | ||
3909 | /* File permission MUST be 660 */ | |
3910 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
3911 | if (ret < 0) { | |
d6f42150 | 3912 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
3913 | perror("chmod"); |
3914 | goto end; | |
3915 | } | |
3916 | ||
3917 | /* Create the application unix socket */ | |
d6f42150 DG |
3918 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
3919 | if (apps_sock < 0) { | |
3920 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
3921 | ret = -1; |
3922 | goto end; | |
3923 | } | |
3924 | ||
d6f42150 | 3925 | /* File permission MUST be 666 */ |
54d01ffb DG |
3926 | ret = chmod(apps_unix_sock_path, |
3927 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
fac6795d | 3928 | if (ret < 0) { |
d6f42150 | 3929 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
3930 | perror("chmod"); |
3931 | goto end; | |
3932 | } | |
3933 | ||
3934 | end: | |
3935 | umask(old_umask); | |
3936 | return ret; | |
3937 | } | |
3938 | ||
3939 | /* | |
54d01ffb DG |
3940 | * Check if the global socket is available, and if a daemon is answering at the |
3941 | * other side. If yes, error is returned. | |
fac6795d | 3942 | */ |
cf3af59e | 3943 | static int check_existing_daemon(void) |
fac6795d | 3944 | { |
7d8234d9 | 3945 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 3946 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 3947 | return 0; |
099e26bd | 3948 | } |
54d01ffb | 3949 | |
7d8234d9 | 3950 | /* Is there anybody out there ? */ |
099e26bd | 3951 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 3952 | return -EEXIST; |
099e26bd | 3953 | } else { |
7d8234d9 | 3954 | return 0; |
099e26bd | 3955 | } |
fac6795d DG |
3956 | } |
3957 | ||
fac6795d | 3958 | /* |
d063d709 | 3959 | * Set the tracing group gid onto the client socket. |
5e16da05 | 3960 | * |
d063d709 DG |
3961 | * Race window between mkdir and chown is OK because we are going from more |
3962 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 3963 | */ |
be040666 | 3964 | static int set_permissions(char *rundir) |
fac6795d DG |
3965 | { |
3966 | int ret; | |
996b65c8 | 3967 | gid_t gid; |
fac6795d | 3968 | |
996b65c8 MD |
3969 | gid = allowed_group(); |
3970 | if (gid < 0) { | |
be040666 DG |
3971 | WARN("No tracing group detected"); |
3972 | ret = 0; | |
fac6795d DG |
3973 | goto end; |
3974 | } | |
3975 | ||
d6f42150 | 3976 | /* Set lttng run dir */ |
be040666 | 3977 | ret = chown(rundir, 0, gid); |
d6f42150 | 3978 | if (ret < 0) { |
be040666 | 3979 | ERR("Unable to set group on %s", rundir); |
d6f42150 DG |
3980 | perror("chown"); |
3981 | } | |
3982 | ||
3983 | /* lttng client socket path */ | |
996b65c8 | 3984 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 3985 | if (ret < 0) { |
d6f42150 DG |
3986 | ERR("Unable to set group on %s", client_unix_sock_path); |
3987 | perror("chown"); | |
3988 | } | |
3989 | ||
3bd1e081 MD |
3990 | /* kconsumer error socket path */ |
3991 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); | |
d6f42150 | 3992 | if (ret < 0) { |
3bd1e081 MD |
3993 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
3994 | perror("chown"); | |
3995 | } | |
3996 | ||
7753dea8 MD |
3997 | /* 64-bit ustconsumer error socket path */ |
3998 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); | |
3999 | if (ret < 0) { | |
4000 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); | |
4001 | perror("chown"); | |
4002 | } | |
4003 | ||
4004 | /* 32-bit ustconsumer compat32 error socket path */ | |
4005 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); | |
3bd1e081 | 4006 | if (ret < 0) { |
7753dea8 | 4007 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
fac6795d DG |
4008 | perror("chown"); |
4009 | } | |
4010 | ||
d6f42150 | 4011 | DBG("All permissions are set"); |
e07ae692 | 4012 | |
fac6795d DG |
4013 | end: |
4014 | return ret; | |
4015 | } | |
4016 | ||
7a485870 | 4017 | /* |
d063d709 | 4018 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
4019 | */ |
4020 | static int create_kernel_poll_pipe(void) | |
4021 | { | |
4022 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
4023 | } | |
4024 | ||
099e26bd DG |
4025 | /* |
4026 | * Create the application command pipe to wake thread_manage_apps. | |
4027 | */ | |
4028 | static int create_apps_cmd_pipe(void) | |
4029 | { | |
4030 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
4031 | } | |
4032 | ||
d6f42150 | 4033 | /* |
d063d709 | 4034 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 | 4035 | */ |
67e40797 | 4036 | static int create_lttng_rundir(const char *rundir) |
d6f42150 DG |
4037 | { |
4038 | int ret; | |
4039 | ||
67e40797 DG |
4040 | DBG3("Creating LTTng run directory: %s", rundir); |
4041 | ||
4042 | ret = mkdir(rundir, S_IRWXU | S_IRWXG ); | |
d6f42150 | 4043 | if (ret < 0) { |
b1f11e69 | 4044 | if (errno != EEXIST) { |
67e40797 | 4045 | ERR("Unable to create %s", rundir); |
b1f11e69 DG |
4046 | goto error; |
4047 | } else { | |
4048 | ret = 0; | |
4049 | } | |
d6f42150 DG |
4050 | } |
4051 | ||
4052 | error: | |
4053 | return ret; | |
4054 | } | |
4055 | ||
4056 | /* | |
d063d709 DG |
4057 | * Setup sockets and directory needed by the kconsumerd communication with the |
4058 | * session daemon. | |
d6f42150 | 4059 | */ |
67e40797 DG |
4060 | static int set_consumer_sockets(struct consumer_data *consumer_data, |
4061 | const char *rundir) | |
d6f42150 DG |
4062 | { |
4063 | int ret; | |
67e40797 | 4064 | char path[PATH_MAX]; |
d6f42150 | 4065 | |
67e40797 | 4066 | switch (consumer_data->type) { |
7753dea8 | 4067 | case LTTNG_CONSUMER_KERNEL: |
67e40797 | 4068 | snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); |
7753dea8 MD |
4069 | break; |
4070 | case LTTNG_CONSUMER64_UST: | |
67e40797 | 4071 | snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); |
7753dea8 MD |
4072 | break; |
4073 | case LTTNG_CONSUMER32_UST: | |
67e40797 | 4074 | snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); |
7753dea8 MD |
4075 | break; |
4076 | default: | |
4077 | ERR("Consumer type unknown"); | |
4078 | ret = -EINVAL; | |
4079 | goto error; | |
d6f42150 DG |
4080 | } |
4081 | ||
67e40797 DG |
4082 | DBG2("Creating consumer directory: %s", path); |
4083 | ||
3bd1e081 | 4084 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
d6f42150 | 4085 | if (ret < 0) { |
6beb2242 | 4086 | if (errno != EEXIST) { |
3bd1e081 | 4087 | ERR("Failed to create %s", path); |
6beb2242 DG |
4088 | goto error; |
4089 | } | |
4090 | ret = 0; | |
d6f42150 DG |
4091 | } |
4092 | ||
4093 | /* Create the kconsumerd error unix socket */ | |
3bd1e081 MD |
4094 | consumer_data->err_sock = |
4095 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); | |
4096 | if (consumer_data->err_sock < 0) { | |
4097 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); | |
d6f42150 DG |
4098 | ret = -1; |
4099 | goto error; | |
4100 | } | |
4101 | ||
4102 | /* File permission MUST be 660 */ | |
3bd1e081 | 4103 | ret = chmod(consumer_data->err_unix_sock_path, |
54d01ffb | 4104 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
d6f42150 | 4105 | if (ret < 0) { |
3bd1e081 | 4106 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
67e40797 | 4107 | PERROR("chmod"); |
d6f42150 DG |
4108 | goto error; |
4109 | } | |
4110 | ||
4111 | error: | |
4112 | return ret; | |
4113 | } | |
4114 | ||
fac6795d | 4115 | /* |
d063d709 | 4116 | * Signal handler for the daemon |
cf3af59e | 4117 | * |
54d01ffb DG |
4118 | * Simply stop all worker threads, leaving main() return gracefully after |
4119 | * joining all threads and calling cleanup(). | |
fac6795d DG |
4120 | */ |
4121 | static void sighandler(int sig) | |
4122 | { | |
4123 | switch (sig) { | |
cf3af59e MD |
4124 | case SIGPIPE: |
4125 | DBG("SIGPIPE catched"); | |
4126 | return; | |
4127 | case SIGINT: | |
4128 | DBG("SIGINT catched"); | |
4129 | stop_threads(); | |
4130 | break; | |
4131 | case SIGTERM: | |
4132 | DBG("SIGTERM catched"); | |
4133 | stop_threads(); | |
4134 | break; | |
4135 | default: | |
4136 | break; | |
fac6795d | 4137 | } |
fac6795d DG |
4138 | } |
4139 | ||
4140 | /* | |
d063d709 | 4141 | * Setup signal handler for : |
1d4b027a | 4142 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 4143 | */ |
1d4b027a | 4144 | static int set_signal_handler(void) |
fac6795d | 4145 | { |
1d4b027a DG |
4146 | int ret = 0; |
4147 | struct sigaction sa; | |
4148 | sigset_t sigset; | |
fac6795d | 4149 | |
1d4b027a DG |
4150 | if ((ret = sigemptyset(&sigset)) < 0) { |
4151 | perror("sigemptyset"); | |
4152 | return ret; | |
4153 | } | |
d6f42150 | 4154 | |
1d4b027a DG |
4155 | sa.sa_handler = sighandler; |
4156 | sa.sa_mask = sigset; | |
4157 | sa.sa_flags = 0; | |
4158 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
4159 | perror("sigaction"); | |
4160 | return ret; | |
d6f42150 DG |
4161 | } |
4162 | ||
1d4b027a DG |
4163 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
4164 | perror("sigaction"); | |
4165 | return ret; | |
d6f42150 | 4166 | } |
aaf26714 | 4167 | |
1d4b027a DG |
4168 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
4169 | perror("sigaction"); | |
4170 | return ret; | |
8c0faa1d DG |
4171 | } |
4172 | ||
1d4b027a DG |
4173 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
4174 | ||
4175 | return ret; | |
fac6795d DG |
4176 | } |
4177 | ||
f3ed775e | 4178 | /* |
d063d709 DG |
4179 | * Set open files limit to unlimited. This daemon can open a large number of |
4180 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
4181 | */ |
4182 | static void set_ulimit(void) | |
4183 | { | |
4184 | int ret; | |
4185 | struct rlimit lim; | |
4186 | ||
a88df331 | 4187 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
4188 | lim.rlim_cur = 65535; |
4189 | lim.rlim_max = 65535; | |
4190 | ||
4191 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
4192 | if (ret < 0) { | |
4193 | perror("failed to set open files limit"); | |
4194 | } | |
4195 | } | |
4196 | ||
fac6795d DG |
4197 | /* |
4198 | * main | |
4199 | */ | |
4200 | int main(int argc, char **argv) | |
4201 | { | |
fac6795d DG |
4202 | int ret = 0; |
4203 | void *status; | |
b082db07 | 4204 | const char *home_path; |
fac6795d | 4205 | |
f6a9efaa DG |
4206 | rcu_register_thread(); |
4207 | ||
273ea72c | 4208 | /* Create thread quit pipe */ |
cf3af59e MD |
4209 | if ((ret = init_thread_quit_pipe()) < 0) { |
4210 | goto error; | |
273ea72c DG |
4211 | } |
4212 | ||
7753dea8 | 4213 | setup_consumerd_path(); |
fb09408a | 4214 | |
fac6795d DG |
4215 | /* Parse arguments */ |
4216 | progname = argv[0]; | |
4217 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 4218 | goto error; |
fac6795d DG |
4219 | } |
4220 | ||
4221 | /* Daemonize */ | |
4222 | if (opt_daemon) { | |
53094c05 DG |
4223 | ret = daemon(0, 0); |
4224 | if (ret < 0) { | |
4225 | perror("daemon"); | |
cf3af59e | 4226 | goto error; |
53094c05 | 4227 | } |
fac6795d DG |
4228 | } |
4229 | ||
4230 | /* Check if daemon is UID = 0 */ | |
4231 | is_root = !getuid(); | |
4232 | ||
fac6795d | 4233 | if (is_root) { |
67e40797 DG |
4234 | rundir = strdup(LTTNG_RUNDIR); |
4235 | ||
4236 | /* Create global run dir with root access */ | |
4237 | ret = create_lttng_rundir(rundir); | |
d6f42150 | 4238 | if (ret < 0) { |
cf3af59e | 4239 | goto error; |
d6f42150 DG |
4240 | } |
4241 | ||
fac6795d | 4242 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
4243 | snprintf(apps_unix_sock_path, PATH_MAX, |
4244 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
4245 | } |
4246 | ||
4247 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
4248 | snprintf(client_unix_sock_path, PATH_MAX, |
4249 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
4250 | } | |
0fdd1e2c DG |
4251 | |
4252 | /* Set global SHM for ust */ | |
4253 | if (strlen(wait_shm_path) == 0) { | |
4254 | snprintf(wait_shm_path, PATH_MAX, | |
4255 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); | |
4256 | } | |
67e40797 DG |
4257 | |
4258 | /* Setup kernel consumerd path */ | |
4259 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, | |
4260 | KCONSUMERD_ERR_SOCK_PATH, rundir); | |
4261 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, | |
4262 | KCONSUMERD_CMD_SOCK_PATH, rundir); | |
4263 | ||
4264 | DBG2("Kernel consumer err path: %s", | |
4265 | kconsumer_data.err_unix_sock_path); | |
4266 | DBG2("Kernel consumer cmd path: %s", | |
4267 | kconsumer_data.cmd_unix_sock_path); | |
fac6795d | 4268 | } else { |
b082db07 DG |
4269 | home_path = get_home_dir(); |
4270 | if (home_path == NULL) { | |
273ea72c DG |
4271 | /* TODO: Add --socket PATH option */ |
4272 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
4273 | ret = -EPERM; |
4274 | goto error; | |
b082db07 DG |
4275 | } |
4276 | ||
67e40797 DG |
4277 | /* |
4278 | * Create rundir from home path. This will create something like | |
4279 | * $HOME/.lttng | |
4280 | */ | |
4281 | ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); | |
4282 | if (ret < 0) { | |
4283 | ret = -ENOMEM; | |
4284 | goto error; | |
4285 | } | |
4286 | ||
4287 | ret = create_lttng_rundir(rundir); | |
4288 | if (ret < 0) { | |
4289 | goto error; | |
4290 | } | |
4291 | ||
fac6795d | 4292 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 4293 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 4294 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
4295 | } |
4296 | ||
4297 | /* Set the cli tool unix socket path */ | |
4298 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 4299 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 4300 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d | 4301 | } |
0fdd1e2c DG |
4302 | |
4303 | /* Set global SHM for ust */ | |
4304 | if (strlen(wait_shm_path) == 0) { | |
4305 | snprintf(wait_shm_path, PATH_MAX, | |
4306 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); | |
4307 | } | |
fac6795d DG |
4308 | } |
4309 | ||
847177cd DG |
4310 | DBG("Client socket path %s", client_unix_sock_path); |
4311 | DBG("Application socket path %s", apps_unix_sock_path); | |
67e40797 DG |
4312 | DBG("LTTng run directory path: %s", rundir); |
4313 | ||
4314 | /* 32 bits consumerd path setup */ | |
4315 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, | |
4316 | USTCONSUMERD32_ERR_SOCK_PATH, rundir); | |
4317 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, | |
4318 | USTCONSUMERD32_CMD_SOCK_PATH, rundir); | |
4319 | ||
4320 | DBG2("UST consumer 32 bits err path: %s", | |
4321 | ustconsumer32_data.err_unix_sock_path); | |
4322 | DBG2("UST consumer 32 bits cmd path: %s", | |
4323 | ustconsumer32_data.cmd_unix_sock_path); | |
4324 | ||
4325 | /* 64 bits consumerd path setup */ | |
4326 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, | |
4327 | USTCONSUMERD64_ERR_SOCK_PATH, rundir); | |
4328 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, | |
4329 | USTCONSUMERD64_CMD_SOCK_PATH, rundir); | |
4330 | ||
4331 | DBG2("UST consumer 64 bits err path: %s", | |
4332 | ustconsumer64_data.err_unix_sock_path); | |
4333 | DBG2("UST consumer 64 bits cmd path: %s", | |
4334 | ustconsumer64_data.cmd_unix_sock_path); | |
847177cd | 4335 | |
273ea72c | 4336 | /* |
7d8234d9 | 4337 | * See if daemon already exist. |
fac6795d | 4338 | */ |
7d8234d9 | 4339 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 4340 | ERR("Already running daemon.\n"); |
273ea72c | 4341 | /* |
cf3af59e MD |
4342 | * We do not goto exit because we must not cleanup() |
4343 | * because a daemon is already running. | |
ab118b20 | 4344 | */ |
cf3af59e | 4345 | goto error; |
a88df331 DG |
4346 | } |
4347 | ||
54d01ffb | 4348 | /* After this point, we can safely call cleanup() with "goto exit" */ |
a88df331 DG |
4349 | |
4350 | /* | |
4351 | * These actions must be executed as root. We do that *after* setting up | |
4352 | * the sockets path because we MUST make the check for another daemon using | |
4353 | * those paths *before* trying to set the kernel consumer sockets and init | |
4354 | * kernel tracer. | |
4355 | */ | |
4356 | if (is_root) { | |
67e40797 | 4357 | ret = set_consumer_sockets(&kconsumer_data, rundir); |
7753dea8 MD |
4358 | if (ret < 0) { |
4359 | goto exit; | |
4360 | } | |
4361 | ||
a88df331 | 4362 | /* Setup kernel tracer */ |
4fba7219 DG |
4363 | if (!opt_no_kernel) { |
4364 | init_kernel_tracer(); | |
4365 | } | |
a88df331 DG |
4366 | |
4367 | /* Set ulimit for open files */ | |
4368 | set_ulimit(); | |
fac6795d DG |
4369 | } |
4370 | ||
67e40797 DG |
4371 | ret = set_consumer_sockets(&ustconsumer64_data, rundir); |
4372 | if (ret < 0) { | |
4373 | goto exit; | |
4374 | } | |
4375 | ||
4376 | ret = set_consumer_sockets(&ustconsumer32_data, rundir); | |
4377 | if (ret < 0) { | |
4378 | goto exit; | |
4379 | } | |
4380 | ||
cf3af59e MD |
4381 | if ((ret = set_signal_handler()) < 0) { |
4382 | goto exit; | |
fac6795d DG |
4383 | } |
4384 | ||
d6f42150 | 4385 | /* Setup the needed unix socket */ |
cf3af59e MD |
4386 | if ((ret = init_daemon_socket()) < 0) { |
4387 | goto exit; | |
fac6795d DG |
4388 | } |
4389 | ||
4390 | /* Set credentials to socket */ | |
be040666 | 4391 | if (is_root && ((ret = set_permissions(rundir)) < 0)) { |
cf3af59e | 4392 | goto exit; |
fac6795d DG |
4393 | } |
4394 | ||
5b8719f5 DG |
4395 | /* Get parent pid if -S, --sig-parent is specified. */ |
4396 | if (opt_sig_parent) { | |
4397 | ppid = getppid(); | |
4398 | } | |
4399 | ||
7a485870 | 4400 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
4401 | if ((ret = create_kernel_poll_pipe()) < 0) { |
4402 | goto exit; | |
7a485870 DG |
4403 | } |
4404 | ||
099e26bd DG |
4405 | /* Setup the thread apps communication pipe. */ |
4406 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
4407 | goto exit; | |
4408 | } | |
4409 | ||
4410 | /* Init UST command queue. */ | |
4411 | cds_wfq_init(&ust_cmd_queue.queue); | |
4412 | ||
f6a9efaa DG |
4413 | /* Init UST app hash table */ |
4414 | ust_app_ht_alloc(); | |
4415 | ||
273ea72c | 4416 | /* |
54d01ffb DG |
4417 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
4418 | * statically declared in session.c | |
273ea72c | 4419 | */ |
54d01ffb | 4420 | session_list_ptr = session_get_list(); |
b5541356 | 4421 | |
5eb91c98 DG |
4422 | /* Set up max poll set size */ |
4423 | lttng_poll_set_max_size(); | |
4424 | ||
cf3af59e | 4425 | /* Create thread to manage the client socket */ |
099e26bd DG |
4426 | ret = pthread_create(&client_thread, NULL, |
4427 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 4428 | if (ret != 0) { |
099e26bd | 4429 | perror("pthread_create clients"); |
cf3af59e MD |
4430 | goto exit_client; |
4431 | } | |
fac6795d | 4432 | |
099e26bd DG |
4433 | /* Create thread to dispatch registration */ |
4434 | ret = pthread_create(&dispatch_thread, NULL, | |
4435 | thread_dispatch_ust_registration, (void *) NULL); | |
4436 | if (ret != 0) { | |
4437 | perror("pthread_create dispatch"); | |
4438 | goto exit_dispatch; | |
4439 | } | |
4440 | ||
4441 | /* Create thread to manage application registration. */ | |
4442 | ret = pthread_create(®_apps_thread, NULL, | |
4443 | thread_registration_apps, (void *) NULL); | |
4444 | if (ret != 0) { | |
4445 | perror("pthread_create registration"); | |
4446 | goto exit_reg_apps; | |
4447 | } | |
4448 | ||
cf3af59e | 4449 | /* Create thread to manage application socket */ |
54d01ffb DG |
4450 | ret = pthread_create(&apps_thread, NULL, |
4451 | thread_manage_apps, (void *) NULL); | |
cf3af59e | 4452 | if (ret != 0) { |
099e26bd | 4453 | perror("pthread_create apps"); |
cf3af59e MD |
4454 | goto exit_apps; |
4455 | } | |
fac6795d | 4456 | |
cf3af59e | 4457 | /* Create kernel thread to manage kernel event */ |
54d01ffb DG |
4458 | ret = pthread_create(&kernel_thread, NULL, |
4459 | thread_manage_kernel, (void *) NULL); | |
cf3af59e | 4460 | if (ret != 0) { |
099e26bd | 4461 | perror("pthread_create kernel"); |
cf3af59e MD |
4462 | goto exit_kernel; |
4463 | } | |
7a485870 | 4464 | |
cf3af59e MD |
4465 | ret = pthread_join(kernel_thread, &status); |
4466 | if (ret != 0) { | |
4467 | perror("pthread_join"); | |
4468 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
4469 | } |
4470 | ||
cf3af59e MD |
4471 | exit_kernel: |
4472 | ret = pthread_join(apps_thread, &status); | |
4473 | if (ret != 0) { | |
4474 | perror("pthread_join"); | |
4475 | goto error; /* join error, exit without cleanup */ | |
4476 | } | |
fac6795d | 4477 | |
cf3af59e | 4478 | exit_apps: |
099e26bd DG |
4479 | ret = pthread_join(reg_apps_thread, &status); |
4480 | if (ret != 0) { | |
4481 | perror("pthread_join"); | |
4482 | goto error; /* join error, exit without cleanup */ | |
4483 | } | |
4484 | ||
4485 | exit_reg_apps: | |
4486 | ret = pthread_join(dispatch_thread, &status); | |
4487 | if (ret != 0) { | |
4488 | perror("pthread_join"); | |
4489 | goto error; /* join error, exit without cleanup */ | |
4490 | } | |
4491 | ||
4492 | exit_dispatch: | |
cf3af59e MD |
4493 | ret = pthread_join(client_thread, &status); |
4494 | if (ret != 0) { | |
4495 | perror("pthread_join"); | |
4496 | goto error; /* join error, exit without cleanup */ | |
4497 | } | |
4498 | ||
3bd1e081 | 4499 | ret = join_consumer_thread(&kconsumer_data); |
cf3af59e | 4500 | if (ret != 0) { |
3bd1e081 | 4501 | perror("join_consumer"); |
cf3af59e MD |
4502 | goto error; /* join error, exit without cleanup */ |
4503 | } | |
a88df331 | 4504 | |
cf3af59e | 4505 | exit_client: |
a88df331 | 4506 | exit: |
cf3af59e MD |
4507 | /* |
4508 | * cleanup() is called when no other thread is running. | |
4509 | */ | |
f6a9efaa | 4510 | rcu_thread_online(); |
cf3af59e | 4511 | cleanup(); |
f6a9efaa DG |
4512 | rcu_thread_offline(); |
4513 | rcu_unregister_thread(); | |
67e40797 | 4514 | if (!ret) { |
cf3af59e | 4515 | exit(EXIT_SUCCESS); |
67e40797 | 4516 | } |
cf3af59e | 4517 | error: |
5e16da05 | 4518 | exit(EXIT_FAILURE); |
fac6795d | 4519 | } |